Emotional and neuroendocrine regulation in very preterm and full-term infants at six months of age

Cortisol reactivity and negative affect among preterm infants at 12 months during a mother-infant interaction task

The purpose of this study was to investigate correlates of preterm (PT) infant's cortisol reactivity and the association to infant negative affect, during a mother-infant interaction procedure. Participants included 48 infants born prematurely (gestational age < 37 weeks) and their mothers, assessed when infants were 12 months old corrected for prematurity. The examined variables comprised both neonatal and environmental dimensions including maternal interactive behavior. Infant negative affect and maternal interactive behavior were assessed with a standardized mother-infant interaction task. A baseline infant saliva sample was collected before the interaction began, and a second sample after the interaction episodes ended. Results revealed that decrease of infant's cortisol concentration was significantly associated with the exposure to more sensitive, and less intrusive maternal behaviors. However, once controlled for neonatal risk, family SES and maternal psychological distress, the associations were rendered non-significant. Although the association between cortisol reactivity and negative affect trended toward significance, maternal intrusiveness was the only significant predictor of observed infant negative affect. Findings suggest the importance of primary relational experiences on PT infants' early regulatory competencies.

Observed Progression of Parents' Understanding of Preterm Infants' Behavioral Signs at 33 to 35 Weeks Corrected Age

BACKGROUND

Interventions aimed at improving parental understanding of preterm infants' behavioral signs have drawn increased attention in recent years. However, there are limited data regarding parents' actual perceptions of infants' behavior during parent-infant interactions while infants are in a light-sleep state.

PURPOSES

(1) To describe parental perceptions of infants' behavior at 33 to 35 weeks' corrected age during light-sleep and (2) to identify changes in parental perceptions of preterm infants' behavior over time.

METHODS

This study used a qualitative, longitudinal design based on observations and interviews. Three sets of parents and their infants born between 29 and 30 weeks' gestational age were observed up to 3 times during light sleep states when the infants were 33 to 35 weeks' corrected age. Parents were interviewed regarding their perceptions of infant behavior/growth once at the time of observation and once more within 2 weeks of the final observation. The findings are based on the observation of parents' perception-driven interactions with infants.

RESULTS

Four themes emerged describing the transition of parental perception that progresses to gain a better understanding of their infant's behavior through repeated interaction.

IMPLICATIONS FOR PRACTICE

The findings of this study inform caregivers in neonatal intensive care units regarding the unique experience of parent-infant dyads. This knowledge can help promote family-centered developmental care efforts in neonatal intensive care units.

IMPLICATIONS FOR RESEARCH

Further research should focus on studying a larger sample group to confirm the findings and refining strategies to incorporate the findings to enhance neonatal intensive care unit care.