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PubMed1999

Investigation of the role of postnatal testosterone in the expression of sex differences in behavior in infant rhesus macaques (Macaca mulatta).

In several primate species, males have been shown to exhibit a surge in circulating testosterone during the early postnatal period. This surge has been postulated to play a role in the development of sex differences in behavior. In this study, the role of postnatal testosterone in infant behavioral development was investigated in socially living rhesus macaques. Seven male infants were treated with a GnRH agonist, avorelin, from the first week of life onwards. Ten female infants were exposed to testosterone by implantation of capsules containing testosterone. The behavioral development of these and control infants was recorded from birth to 6 months of age. The sexually dimorphic patterns of play and mounting were not affected by manipulation of postnatal testosterone in either male or female infants. Similarly, most mother-infant interactions were not affected by the hormonal manipulation of infants. Mothers of testosterone-treated females were found to take more responsibility for moving into and out of arm's reach of their infants than mothers of some other groups of infants; however, this measure did not normally differ between mothers of male and female infants. Manipulation of the postnatal testosterone surge does significantly affect penile growth and development, but does not affect the expression of infant sex differences in behavior nor greatly affect the development of the mother-infant relationship in rhesus macaques.

Age Factors↗
PubMed1990

Personality variables as assessed by the MMPI and their relationship to mother-infant interactional behaviors at age three months.

The present study examined whether maternal personality variables, as assessed on the MMPI, relate to early infant and maternal variables. The subjects were 14 low-risk preterm and 24 full-term 3-mo.-old infants and their mothers. A female experimenter visited each infant at home where the mother and the experimenter each took turns and talked to the baby for 3 min. Subsequently, each infant was given a differential vocal response score by taking the amount of time spent in nondistress vocalizing in response to the stranger from the time spent in similar vocalizing in response to the mother. Following the 3-min. interactions, the mother and infant were observed for 30 min. and several mother-infant behaviors were recorded. Finally, the mothers were administered the MMPI. Analysis showed that high scores on Scales 3, 6, and Ego Control were related to less favorable mother-infant interactions and high scores on the Femininity and Ego Control Scales were related to infants' low differential vocal response scores.

Female↗
PubMed1976

Focus on maternal behavior in infant intervention.

A six-stage maternal behavior progression is outlined, and its use as a schema for the assessment of parental behavior in parent-infant interaction is described. This approach focuses on parent-infant interaction, rather than the teaching of infant skills, as a basis for enhancing cognitive and affective development of the child. Use of the schema is illustrated in two cases from an intervention program for high-risk infants.

Behavior Therapy↗
PubMed1995

Serum prolactin levels and behavior in infants.

This study examined the relationship between serum prolactin levels and behavior in infants and toddlers who experienced two potentially stressful experiences (developmental testing and venipuncture). Serum prolactin levels showed considerable consistency over a 3-month period (r = 0.64 between study entry and three months, p < 0.001, n = 50). There was also stability in having either a normal or a high value (> or = 25 ng/ml). Among children who had a normal value on initial testing, 97% also has a normal value after 3 months; 55% of those with initial high values continued to have high values (chi 2 = 19.26, p < 0.001). Children with high serum prolactin levels were more likely to be rated as unusually hesitant and unhappy during developmental testing. Overall, 53% of the children with serum prolactin levels > or = 25 ng/ml were considered abnormal in affect, compared to 20% of those with lower serum prolactin values (total n = 138, chi 2 = 13.56, p < 0.001). These results suggest that, even in early life, serum prolactin levels may reflect characteristic individual behavioral and neuroendocrine responses to stress.

Female↗
PubMed1990

Infant social behavior in front of a mirror and in front of a familiar and an unfamiliar peer.

In this study, we explored the differences in infant social behaviors in front of the mirror and in front of a familiar and an unfamiliar peer. We assumed that infant social behaviors in front of the mirror constitute mainly an exploration of the mirror image characteristics. Our observations were videotaped and coded according to definitions of social behavior in infant-infant situations. The results obtained indicate that 6- to 13-month-old infants display significantly more frequent social behaviors in front of a mirror than in front of a familiar or an unfamiliar peer. These behaviors are characterized by tactile contact with the mirror surface, adapting the hand to this surface, and very frequent coordinated social behaviors. This pattern of social behaviors in front of the mirror is discussed and linked to the exploration of distinctive characteristics of the self-reflected image such as perfect synchronicity of movement and two-dimensionality.

Body Image↗
PubMed2003

Risk factors for suboptimal infant breastfeeding behavior, delayed onset of lactation, and excess neonatal weight loss.

OBJECTIVE: Some mothers have difficulty initiating lactation even when highly motivated to breastfeed. The purpose of this study was to determine the incidence of and risk factors for suboptimal infant breastfeeding behavior (SIBB), delayed onset of lactation, and excess neonatal weight loss among mother-infant pairs in a population with high educational levels and motivation to breastfeed. METHODS: All mothers residing in Davis, California, who gave birth to a healthy, single, term infant at 1 of 5 area hospitals during the 10-month recruitment period in 1999 were invited to participate if they were willing to attempt to breastfeed exclusively for at least 1 month. Lactation guidance was provided and data were collected in the hospital (day 0) and on days 3, 5, 7, and 14. Infant breastfeeding behavior was evaluated by trained lactation consultants using the Infant Breastfeeding Assessment Tool. Onset of lactation was defined based on maternal report of changes in breast fullness. Infant weight loss was considered excessive if it was >or=10% of birth weight by day 3. RESULTS: Of the 328 eligible mothers, 280 (85%) participated in the study. The prevalence of SIBB was 49% on day 0, 22% on day 3, and 14% on day 7. SIBB was significantly associated with primiparity (days 0 and 3), cesarean section (in multiparas, day 0), flat or inverted nipples, infant status at birth (days 0 and 3), use of nonbreast milk fluids in the first 48 hours (days 3 and 7), pacifier use (day 3), stage II labor >1 hour (day 7), maternal body mass index >27 kg/m(2) (day 7) and birth weight <3600 g (day 7). Delayed onset of lactation (>72 hours) occurred in 22% of women and was associated with primiparity, cesarean section, stage II labor >1 hour, maternal body mass index >27 kg/m(2), flat or inverted nipples, and birth weight >3600 g (in primiparas). Excess weight loss occurred in 12% of infants and was associated with primiparity, long duration of labor, use of labor medications (in multiparas), and infant status at birth. The risk of excess infant weight loss was 7.1 times greater if the mother had delayed onset of lactation, and 2.6 times greater if the infant had SIBB on day 0. CONCLUSIONS: Early lactation success is strongly influenced by parity, but may also be affected by potentially modifiable factors such as delivery mode, duration of labor, labor medications, use of nonbreast milk fluids and/or pacifiers, and maternal overweight. All breastfeeding mother-infant pairs should be evaluated at 72 to 96 hours' postpartum.

Birth Weight↗
PubMed2002

Fear of spoiling in at-risk African American mothers.

Mothers actively ascribe intention to the behavior of infants. Mothers also tailor their responses to infant behavior based on conceptions of how each response will influence later behavior. Fears of spoiling an infant may influence a mother's pattern of responsiveness. Sixty-eight at-risk African American mothers completed questionnaires assessing depressive symptoms, self-efficacy, empathy, developmental expectations, and beliefs about spoiling. Mothers with greater concerns about the long-term impact of spoiling reported higher levels of depression, more ways in which infants could be spoiled, and inappropriate developmental expectations when compared to mothers with fewer concerns. The pattern of findings suggests ways that fear of spoiling may influence maternal responsiveness in high-risk groups and potentially lead to disturbed mother-infant relationships.

Adolescent↗
PubMed1991

Defensive behaviors in infant rhesus monkeys: ontogeny and context-dependent selective expression.

We examined the ontogeny of the infant rhesus monkey's defensive behaviors and the ability to modulate them in response to specific environmental cues. Rhesus infants in 4 age groups (N = 8 per group) were briefly separated from their mothers and tested under 3 conditions: alone, in the presence of a human who averted his gaze, and in the presence of a human staring at them. Infants as young as 0 to 2 weeks displayed defensive behaviors but did not selectively respond to the human's presence or direction of gaze. By 9 to 12 weeks of age, infants modulated their responses in relation to the parameters of the threat. At this age, infant rhesus monkeys undergo cognitive and emotional changes associated with brain development similar to those in human infants 7 to 12 months old. This also is the time when human infants engage in complex emotional and behavioral responses to threatening situations. Understanding the development and expression of defensive behaviors in infant monkeys should be applicable to similar issues in emotional development of human infants.

Aging↗
PubMed1964

BEHAVIOR OF INFANT MONKEYS: DIFFERENCES ATTRIBUTABLE TO MODE OF BIRTH.

A comparison of behavior of infant monkeys shortly after birth reveals differences in reactivity which can be related to the route of delivery, whether vaginal or cesarean section. The depression of behavior in the surgically delivered infants persists through day 5 postpartum and ultimately appears as lowered conditionability. Anesthetics or other drugs are not causal factors.

Animals↗
PubMed2001

Development of sucking behavior in infants with Down's syndrome.

UNLABELLED: The aim of this study was to gain a better understanding of the development of sucking behavior in infants with Down's syndrome. The sucking behavior of 14 infants with Down's syndrome was consecutively studied at 1, 4, 8 and 12 mo of age. They were free from complications that may cause sucking difficulty. The sucking pressure, expression pressure, frequency and duration were measured. In addition, an ultrasound study during sucking was performed in sagittal planes. Although levels of the sucking pressure and duration were in the normal range, significant development occurred with time. Ultrasonographic images showed deficiency in the smooth peristaltic tongue movement. CONCLUSION: The sucking deficiency in Down's syndrome may result from not only hypotonicity of the perioral muscles, lips and masticatory muscles, but also deficiency in the smooth tongue movement. This approach using the sucking pressure waveform and ultrasonography can help in the examination of the development of sucking behavior, intraoral movement and therapeutic effects.

Down Syndrome↗
PubMed1996

Development of the Preterm Infant Breastfeeding Behavior Scale (PIBBS): a study of nurse-mother agreement.

Research on the development of preterm infant feeding behavior has focused mainly on bottlefeeding, using invasive methods or observations by professionals. In this study, a clinical method for observing breastfeeding was developed in collaboration between observers and mothers for the purpose of enabling neonatal personnel and mothers to describe developmental stages in preterm infant breastfeeding behavior. Tests of interobserver reliability resulted in acceptable agreement between observers, but a somewhat lower level of agreement between observers and mothers. The scale showed a good capacity to discriminate between infant gestational ages and can be used for helping mothers to identify their infants' emerging competence.

Breast Feeding↗
PubMedDate not supplied

Maternal response to their chronically ill infants' attachment behavior of crying.

Six chronically ill infants and their mothers were observed in their homes over a three-month period. During this study 388 infant crying bouts and maternal response episodes were analyzed, and compared to the behaviors of a literature control group of 26 well infants and their mothers. Results indicated there are differences between the crying patterns of ill and well infants. Maternal response patterns to ill infant crying seemed to be determined by characteristics of the infant's cry rather than by specific infant characteristics (sex, ordinal position, degree of illness). Implications for maternal-ill infant interaction and implications for nursing practice are discussed.

Adult↗
PubMed2001

Development of sucking behavior in infants who have not been fed for 2 months after birth.

BACKGROUND: Term infants are able to develop sucking behavior after birth. However, the requirements for this development have not yet been fully elucidated. In the present study, we investigated whether an oral-feed practice is necessary for the development of sucking behavior and whether non-nutritive sucking could support the development of this behavior while the infants cannot be fed. METHODS: Subjects of the present study were four term or near-term infants who had never been fed orally for approximately 2 months after birth because of gastrointestinal problems. Sucking pressure was measured with a silicone tube inserted into an artificial nipple and sucking efficiency was calculated during an entire feeding. RESULTS: Sucking pressure, frequency and duration at the first time oral feed corresponded to values obtained for normal-term infants at their first oral feed. Although infants who had not received oral feeding demonstrated poor sucking abilities initially, sucking performance improved with practice. Sucking parameters measured 1 month since oral feeding was initiated in these infants corresponded to values obtained for normal-term infants at 1 month of age. Although infants who had not received oral feeding had often sucked a pacifier for sedation, this non-nutritive sucking did not result in the development of sucking behavior. CONCLUSIONS: These results demonstrate that an oral feeding practice is necessary for the development of sucking behavior and that non-nutritive sucking does not affect the development of sucking.

Enteral Nutrition↗
PubMed1989

Pain behaviors in infants and toddlers.

The purposes of this qualitative study were to describe behaviors of infants and toddlers when in acute pain and to describe changes in those behaviors across the 3-yr span. With the use of naturalistic observation, 32 children, birth to 36 mo of age, were observed following surgery, fractures, or burns. Purposeful sampling of children, who were inpatients of a private midwestern hospital, was used. Data sources included child observations, parent interviews, and patient records. The research method used was grounded theory. Three pain behavior categories were developed, and characteristics of each category were identified. Pain categories included motor movement, communication, and facial expression. Theoretic implications were proposed. It is concluded that predictable changes in pain behaviors occur within infancy and toddlerhood. A matrix of pain behavior is presented.

Child Behavior↗
PubMed1998

Behavior of infants with iron-deficiency anemia.

This study tested the hypothesis that infants with iron-deficiency anemia show behaviors, such as increased proximity to caregivers, increased wariness or hesitance, and decreased activity, that could contribute to "functional isolation." The behavior of 52 Costa Rican 12- to 23-month-old infants with iron-deficiency anemia was contrasted with that of 139 comparison group infants with better iron status during free play and mental and motor testing and in the home. Infants with iron-deficiency anemia maintained closer contact with caregivers; showed less pleasure and delight; were more wary, hesitant, and easily tired; made fewer attempts at test items; were less attentive to instructions and demonstrations; and were less playful. Adult behavior also differed. The results indicate that iron-deficiency anemia in infancy is associated with alterations in affect and activity, suggesting that functional isolation is a useful framework for understanding poorer developmental outcome in iron-deficiency anemia, the world's most common single nutrient deficiency.

Affect↗
PubMed1994

Communication behaviors of infants of teen mothers. An exploratory study.

PURPOSE: To study the relationship between mother-infant interaction and an infant's preverbal communication skills among a group of teenage mothers and their infants, 13 teenage mother-infant pairs were videotaped in a free-play setting. The infants were then videotaped in a structured setting, with an examiner, designed to elicit preverbal communication behaviors. Mothers were < 17 years old and from low SES backgrounds. Their infants were 9-12 months old, full-term, first born, and developmentally normal. METHODS: Mothers' interactions were assessed from the free-play setting using the Parent-Infant Interaction Scale. The infants' preverbal communication behaviors were measured using the Communication and Symbolic Behavior Scales. Both the frequency of communication behaviors and the range of purposes of these behaviors were assessed. RESULTS: A significant correlation was identified between a mother's interaction scores and the range of purposes for which her infant used communication behaviors (p < 0.01). No correlation was found between maternal interaction scores and the frequency of communication behavior. CONCLUSIONS: Infants whose mothers scored poorly on the Parent-Infant Interaction Scale used most of their communication behaviors to demand or protest. Infants from more optimally interacting dyads used communication behaviors for social interaction and commentary as well as to demand or protest. Maternal interaction and an infant's early communication skills appear to be related in this exploratory study.

Adolescent↗
PubMed1984

Spatial summation in dark-adapted human infants.

Behavioral measures of spatial summation in 4- and 11-week old human infants were obtained using the forced-choice preferential looking technique. Infants exhibit complete spatial summation over large areas (4 weeks: 8.9 degrees; 11 weeks: 5.5 degrees), much larger than those of adults tested in the same apparatus (2.6 degrees). Thus, infants' summation areas are larger than adults' by factors of 12 at 4 weeks and 4 at 11 weeks. It is argued that at most, one-half of this difference between the infant and adult data may be due to optical factors (e.g. defocus and small eye size). The remainder probably reflects differences in the neural organization of the immature and mature visual systems.

Adult↗
PubMed2004

A transactional model of parent-infant interactions in alcoholic families.

This study examined the transactional nature of parent-infant interactions over time among alcoholic and nonalcoholic families. The sample consisted of 222 families assessed at 12, 18, and 24 months of child age. Results indicated that infant behavior did not influence parental behavior across time, but parental behavior was longitudinally predictive of infant behavior during play interactions. Higher paternal alcohol consumption at 12 months was longitudinally predictive of negative parental behavior at 24 months. Other significant risk factors included marital conflict, fathers' depression, and fathers' education. Results highlight the nested nature of risk in alcoholic families and the direction of influence from parent to child during interactions and suggest that 1 pathway to risk among these children is through negative parent-infant interactions.

Adult↗