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At just over three months, a head circumference of 43 cm for a baby boy generally does fall within normal range, but it’s always essential to consider the individual’s growth curve and trends. Head size alone doesn’t give the complete picture; regular growth monitoring by your pediatrician is key. The posterior fontanelle, which is the soft spot on the back of a baby’s head, typically closes by about 1 to 3 months of age, but can vary. The fact that it bulges when he’s crying and returns to normal when upright isn’t typically a red flag. Bulging of the fontanelle when a baby is crying can be a normal response due to increased intracranial pressure from crying. What matters more is if it remains bulging when he’s calm, which could indicate increased pressure inside the skull and might need further evaluation. Since your son is active, feeds well, and is gaining weight healthily, those are all positive signs, but it’s still wise to have his pediatrician confirm that everything progresses as it should. Ensure you attend regular check-ups to track his growth and development, this helps rule out any underlying concerns. If you ever observe persistent bulging, unusual irritability, vomiting, or other concerning symptoms, that would be the appropriate time to seek more immediate medical advice. Babies can exhibit a wide range of normal variations, but it’s always best to discuss with your healthcare provider who can oversee and guide you through his specific needs as he grows.
