When my daughter began to talk she would only answer with K, O.K. or Yeah. It drove me a little nuts. So I said to myself I can fix this. If I say yes a lot she will pick it up. So I did my best saying yes instead of yeah to the point where when my daughter would call for me she began answering herself with my response. “Mommy, yes”.
Unfortunately that was not my first time influencing her speach. For the longest time she was obsessed with B words but would not finish them, especially book – boo. So I made sure I really emphasized the “k” sound on the end so that when she was ready she would say it properly. However when she was ready it came out “book”.