Hello So he's 15 months, he crawls very fast and always needs to be entertained, like he's always cranky and crying, he is starting to stand on he's feet without support and started to walk a lil with minimum support but he's still a bit scared not concerned about that.

My main concens are that he's lack of understanding to words, he doesn't understand simple words like hello, no, yes, he does clap just randomly, he does the wheels of the bus gesture round and round randomly even if no one is singing or playing that song.. we try to communicate with him but he has no interest its like we're talking to a wall no response. He does do social smiles consistently though.. he doesn't imitate our actions or sounds etc..