Neurodevelopmental outcome of full-term small-for-gestational-age infants with normal placental function

Area of Science:

• Neonatal development
• Perinatal outcomes
• Pediatric neurology

Background:

• Small-for-gestational-age (SGA) is defined by birth weight below a specific threshold for gestational age.
• Normal placental function, assessed via umbilical artery Doppler, is often used to identify 'constitutionally small' infants.
• The neurodevelopmental trajectory of SGA infants with seemingly normal placental function requires further investigation.

Purpose of the Study:

• To assess the 2-year neurodevelopmental outcomes of full-term SGA newborns with normal placental function.
• To compare these outcomes with appropriate-for-gestational-age (AGA) infants.
• To challenge the assumption that SGA infants with normal Doppler findings have entirely normal development.

Main Methods:

• A cohort study comparing full-term SGA infants (normal umbilical artery Doppler) with full-term AGA infants.
• Neurodevelopmental assessment at 24 months corrected age using the Bayley Scales of Infant and Toddler Development, 3rd Edition (Bayley-III).
• Statistical analysis using MANCOVA and logistic regression, adjusting for gestational age, socioeconomic status, gender, smoking, and breastfeeding.

Main Results:

• 223 infants (112 SGA, 111 AGA) were included; groups differed in socioeconomic status and gestational age.
• SGA infants demonstrated significantly poorer scores in cognitive, language, motor, and adaptive domains at 2 years.
• The SGA group had an increased risk for low language (OR=2.63) and adaptive (OR=2.72) scores.

Conclusions:

• Full-term SGA infants with normal umbilical artery Doppler findings exhibit reduced neurodevelopmental scores at two years.
• These findings question the notion that SGA infants with normal Doppler studies are merely 'constitutionally small'.
• Further research is warranted to understand the long-term implications and potential interventions for this population.