Firstly this swelling is not cancerous, so do not worry. The most likely cause is a condition called 'caput' which is a swelling of the tissues of the baby's scalp with a small amount of bleeding. This occurs usually during the birth process when the baby's head is moving down through the birth passage. Why this should happen to your baby who was born by caesarean is not easy to explain unless you went into labour before the caesarean was done. It would be a good idea for the paediatrician to check your baby again. No biopsy will be needed.
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