My LO is 15 months it hardly blabber anything. Is it something I should worry?

for 15 months I feel it's still too early to be worried. my kid hardly say much till he turn 18 months. now at 26.5 months he can have a simple conversation with me. keep talking to your child and don't use baby talk. speak to him like he is an adult. babies are very smart and they understand, just that now they can't verbalise like us. I once used baby sign language with my kid so that he can communicate with me, I started that when he was 7 months old, and til today he can remember some signs.