15 month old

Amanda

Anyone else have a 15 month old who doesn't really talk?? I can tell my son is very smart and understands what I say but he only says momomomom or dadadadadad and various other sounds but not solid words.. now his dr says he is delayed and he has until his 18 month check up and if still nothing he wants a specialist involved anyone else have this issue?? Or what does your baby say???