If the death of a child happens in a Hindu family, the usual procedure is to bury the body instead of burning on a pyre. The death of the baby happens of before namakarana or naming ceremony – the body is buried. If the naming ceremony was performed before death then the body can be buried or burned on a pyre.
The general rule that is accepted by most Hindu communities is to bury the body, if the death happens before 3 years.
If the death takes place after 3 years – the body is to be burned on a pyre.