My son Jacob will be 2 in August as well.. He mainly speaks in his own little language but we know what he means.. He only said basic words

Jacob doesn't say please or thank you. Admittedly he has said them (0nce) but IMO for manners I have never forced them.. I use them.. When I pass them a drink I say Ta or Thank you. and eventually they pick it up. Jacob has just started saying Ta when he wants a Drink. Before that he would just bring us his cup.

They all learn in thier own time.. If you are concerned go and see your local child health clinic and they can put you in touch with speech therapists even if it just to put your mind at ease..

by the way out of curiousity.. What date was Ava born? Jacob was born on the 22nd August