my 2.5 year old son doesn't speak in sentences can only join two words sometime he doesn't repeat words he can speak 20-30 words understand everything and follows the instructions but doesn't speak what to do

A. So your child can join two words now try to make it 3 to 4 words see your child is doing good as of now it is just that little bit of encouragement and connecting words properly is required as nothing wrong with the speech of the child it is very good just a little bit of encouragement and teaching is required