Question
How long does it take for a newborn’s posterior fontanelle to close? What should be done if it remains open without treatment? Do you need to undergo a CT scan?
Answer
An enlarged posterior fontanelle in newborns could be a sign of congenital hydrocephalus or rickets. Typically, a newborn’s fontanelle can measure up to 4 to 5 centimeters shortly after birth but gradually decreases in size with age. If the fontanelle is abnormally large and exceeds the normal range, it is advisable to visit the hospital for an examination and diagnosis. In some cases, a CT scan or other imaging tests may be required to determine the cause. If you notice any abnormalities in your child’s fontanelle or have any concerns, please contact a doctor promptly for professional advice and treatment.