Thank you for your query on Healthcare Magic.
He has global developmental delay because of his brain problem which occurred due to craniosynostosis or extreme prematurity.
He need complete assessment for milestones in all domains by experts.
Multidisciplinary team is required to assess his disabilities like pediatrician
, physiotherapist, and psychologist
Hence I advise you to take the child to an institute where the facilities of early intervention and rehabilitation facilities are available.
Hope I have answered your query.