My younger son is 17 month old.....and speeks only few words like baba, mamma, dada...he uses lots of gesture like clapping, plays with his elder brother( age-8yrs), responds while calling by his name. He doesn't speek while we tell him to say, but start talking the words while playing by himself. He doesn't point who is mamma n who is pappa if we ask him. My elder son used to say lots of words in this age. Please answer, is everything ok with my younger son?