This thread reminds me of a coalition that was against Spongebob, saying it promotes homosexuality because Spongebob held the hand of his guy friend Patrick, the pink star.
http://www.foxnews.com/story/0,2933,145046,00.htmlNow, I'm not saying that what you're doing is similar as I don't fully know your reasoning. It was just a funny reminder of this story. I'll simply ask you a few questions: Do you consider it "immoral"? What are the consequences for the child of being kissed on the mouth innocently?
Personally, I find a parent kissing his/her child on the mouth as "gross" as giving a bath, changing a diaper and breast-feeding (aka, not at all).
Having a particular background, I look at it through the prism of sexual aggression. A key component of this offence is the sexual connotation of the act. In this particular case, as long as there is no sexual connotation at all, I don't see what can be wrong about it.
It could be interesting if you elaborated on what makes you think it isn't "normal".