Fontanelle status is a pediatric-specific sign most relevant to which age group?

• A. Infants
• B. Toddlers
• C. School-age children
• D. Adolescents

Answer: (A)

Fontanelle status reflects skull growth and intracranial dynamics in infancy. The soft spots, or fontanelles, are present in newborns and young babies to allow rapid brain growth and to accommodate changes in pressure. Because these gaps gradually close as the child ages—posterior fontanelle by about 2–3 months and anterior fontanelle typically by 18–24 months—their status is a sign that is meaningful mainly in infancy. Clinically, a sunken fontanelle can indicate dehydration, while a bulging fontanelle can signal raised intracranial pressure; a normal fontanelle suggests typical skull growth for this age. In older children, the sutures have fused and fontanelles are no longer present, so this sign is not used.