Breastfeeding and motor development in term and preterm infants in a longitudinal US cohort

Kara A Michels1, Akhgar Ghassabian1, Sunni L Mumford1

  • 1Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD.

Insights

This study found that introducing solids alongside breastfeeding in term infants did not significantly impact motor development milestones like standing or walking. Early infant feeding practices appear to have minimal long-term effects on motor skill acquisition.

Area of Science:

  • Pediatrics
  • Developmental Pediatrics
  • Infant Nutrition

Background:

  • Previous studies on breastfeeding and motor development are limited by confounding factors, retrospective data, and early assessment of motor skills.
  • Accurate characterization of the relationship between infant feeding and early motor development requires robust study designs.

Purpose of the Study:

  • To investigate the association between infant feeding methods and the achievement of major motor milestones in a US-based cohort.
  • To provide reliable data on infant feeding and motor development, addressing limitations of prior research.

Main Methods:

  • Utilized data from the Upstate New York Infant Development Screening Program (Upstate KIDS Study) with 4270 infants.
  • Collected infant feeding information at 4 months postpartum and motor development data at 4, 8, 12, 18, and 24 months.
  • Employed accelerated failure time models, adjusting for covariates and stratifying by preterm birth status, to analyze time to standing and walking.

Main Results:

  • Term infants introduced to solids with breast milk showed a trend towards faster achievement of standing and walking, but this was not statistically significant after multiple testing correction.
  • Exclusive breastfeeding prevalence was lower in preterm infants (8%) compared to term infants (19%) at 4 months.
  • No significant feeding-associated differences in motor milestone achievement were observed in preterm infants.

Conclusions:

  • Infant feeding practices, including the introduction of solids, are unlikely to cause substantial differences in the timing of major motor development.
  • The findings suggest that motor development is influenced by a complex interplay of factors beyond infant feeding.
  • The Upstate KIDS Study provides valuable longitudinal data on infant development and feeding.

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