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?

same tayo mommy. iilang words lang din nababanggit ng daughter ko. She doesn't even know how to call me mama but she speaks a few words like "bye, hello, no more, 123" the rest ng sinasabi hindi na mintindihan tas puro iyak pag may gusto. Palagi naman namin siya kinakausap.