My son is 2 yr 10 months old & he is not properly talking. He speaks only single words. Can you suggest me what should I do?

Hell talk when he decides he has something to say. My son was like that at two. Around his 3rd birthday he rapidly started apeaking more and using words i didnt know he knew. Hes about three and a half now and wont shut up using full sentences and learning new words daily. I wouldnt be concerned yet. Give him more tj Ime