hi, welcome to alldeaf.
I'm a mom of a 13 year old deaf boy who was aided when he was 11 months old.
I'd suggest not to decide now of the communication method. Try everything and see what works for him. We used gestures at the beginning but my son was a natural lip reader and with aids he is now completely oral. He knows some signs and plays with it but prefers the oral method. Surely it dosen't work for everybody.
With my little girl, even though I knew she was hearing, I signed for her in her first months and she knew to sign "drink" even before she started speaking.