Evolution of anterior fontanel size in normal infants in the first year of life

Area of Science:

• Pediatrics
• Human Growth and Development
• Cranial Anthropometry

Background:

• Understanding typical cranial growth and anterior fontanel (AF) development is crucial for infant health assessment.
• Existing literature provides established patterns for AF size and closure, but these may not fully represent diverse populations.

Purpose of the Study:

• To analyze cranial growth and anterior fontanel (AF) size dynamics during the first year of life in neurologically normal infants.
• To compare findings with existing literature and assess potential influences of delivery method, gender, and gestational age.

Main Methods:

• A cohort study involving 33 infants assessed longitudinally from birth to 12 months.
• Measurements included head circumference, AF size, anteroposterior distance, biauricular distance, and cephalic index.

Main Results:

• The mean AF size at birth was 1.77 cm².
• Contrary to some literature, AF size showed an increase up to 2 months of age.
• At 12 months, 27.3% of infants had a closed AF.
• No significant differences in cranial anthropometry were observed based on delivery method, gender, or gestational age.

Conclusions:

• The observed increase in AF size in early infancy necessitates a reevaluation of current anthropometric data.
• Establishing updated normative patterns for cranial measurements is essential, particularly for miscegenated populations.
• Current data may require revision to accurately reflect infant cranial development across diverse ethnicities.