Temperament and increased weight gain in infants

Area of Science:

• Pediatrics
• Developmental Psychology
• Child Health

Background:

• Temperament is a key factor in infant development.
• Previous research on infant temperament and weight gain focused mainly on activity levels.
• The relationship between specific temperamental traits and significant weight changes (accelerated or decelerated) remains under-explored.

Purpose of the Study:

• To investigate the association between infant temperamental characteristics and weight gain patterns.
• To identify specific temperament traits linked to accelerated or decelerated weight for length between 6 and 12 months.
• To differentiate temperament profiles of infants with extreme growth trajectories.

Main Methods:

• A random sample of 200 normal infants (6-12 months) was assessed.
• Infants were categorized based on weight for length percentile changes (≥30 point gain or ≥20 point loss).
• Temperament was evaluated using the Infant Temperament Questionnaire, with maternal perception data also collected.

Main Results:

• Infants with the most accelerated weight gain exhibited significantly higher "difficult" temperament ratings (p<0.05) and were perceived as "more difficult than average" by mothers (p<0.001).
• Negative mood, not low activity, was the primary characteristic differentiating infants with accelerated growth (p=0.006).
• Infants with the most decelerated growth showed no significant temperamental differences compared to the general sample.

Conclusions:

• Difficult infant temperament, especially negative mood, is associated with accelerated weight gain.
• The findings suggest a potential behavioral feeding dynamic where fussy infants receive more food.
• Further research is warranted to understand the clinical implications for infant growth and feeding interventions.