Risk factors for weight faltering in infancy according to age at onset

Area of Science:

• Pediatrics
• Child Health
• Developmental Biology

Background:

• Failure to thrive (FTT), characterized by slow weight gain, is a significant concern in infant health.
• Understanding the diverse risk factors associated with FTT is crucial for timely intervention.
• The Copenhagen Child Cohort provides a valuable dataset for longitudinal infant health research.

Purpose of the Study:

• To identify specific risk factors for weight faltering (FTT) in infants.
• To analyze how these risk factors differ based on the age of onset within the first year of life.
• To differentiate etiological mechanisms underlying early-onset versus later-onset FTT.

Main Methods:

• Prospective longitudinal study of 6090 children from the Copenhagen Child Cohort, born in 2000.
• Weight faltering defined as slow conditional weight gain, categorized by onset: 0-2 weeks, 2 weeks-4 months, and 4-8 months.
• Analysis of associations between weight faltering subtypes and various risk factors including birth characteristics, parental factors, and infant health conditions.

Main Results:

• Slow weight gain in infancy is consistently associated with feeding problems across all onset ages.
• Early-onset FTT (0-2 weeks) strongly linked to low birthweight, prematurity, single parenthood, and maternal smoking.
• Later-onset FTT (2 weeks-8 months) associated with congenital disorders, serious illness, and altered mother-child relationships; late-onset (4-8 months) may arise de novo in healthy infants.
• Distinct risk factor profiles identified for early versus later onset of weight faltering.

Conclusions:

• Weight faltering in infancy is multifactorial, with feeding problems being a common correlate.
• The specific underlying risk mechanisms for weight faltering are dependent on the age of onset.
• Differentiating FTT by age of onset is essential for targeted prevention and treatment strategies.