21months not talking

Hi mamsh. May baby is 21months old, but still not talking. Any advice? Should i worry? Ok naman po sya sa attentive naman po when calling out his attention, nag aaction din sya sa mga nursery rhymes. Yun lg po kahit mama or papa di pa po nya masabi. May sounds naman po sya pro words di pa talaga. #worrymommy