While I agree with you that this may just be a familial tenedency,it is unusual for a baby's head circumference to increase from the 50th to the 97% line.One explanation is that the first measurement may not have been done correctly at the time.The signs of hydrocephalus are an obviously very large head, failure of the fontanalle and the skull bone sutures to close and the so-called sunset sign of the eyes, with the whites of the eye visible above the irises but not below. The question to ask your paediatrician is if he is certain that there is no clinical evidence of hydrocephalus and whether it is safe to wait another 6 months.
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