My 14 month old child can say 'b' words - baby, bye bye, and ball, but when it comes to book, he says 'gook.

He also can say the 'm' sound in mommy and mouth but monkey comes out 'gunky'

LOL - I think the 'k' sound in the words throw him off. Did your little one have anything funny they did?
wow, sorry. I had no clue g00k was a bad word.
Just looked it up - great! My son is a racist. LOL