Ds3 babbles alot but doesn't actually say any proper words. He can say Mama and Dada but babbles them rather than saying to me or his Dad. I think his understanding is good as he shakes his head for no or says ye for yes. He has a dummy but only has it if he's tired or upset he doesn't have it in when playing . Ds2 was rambling away at this age. No other concerns with him he eats and sleeps well and is happy content boy.