my son is 5 yr old he is very weak but gaining weight so much he doesn't eat so much he is very slow in writing and learning reason for gaining weight im worried about

A. Namaste Mom, Sorry its a bit unclear, the child if slow in reading and writing , then would suggest to get him to a learning educator, or talk to the teacher . give some extra time and work on his learning issues, basics need to be set well. as far as he is weak.. is it physically ? but you mentioned he is gaining weight ?