I let people think that I hate children.
Why do you act like you don't like kids?
I just want to avoid kissing babies.
Babies aren't for everyone. It's fine if you don't want to kiss people's babies but you shouldn't act like you hate them. Try to politely avoid kissing them instead.
You're right. I'll try that next time.
Good to hear! People will be understanding if you just explain how you feel. You shouldn't feel pressured to do anything you don't want to.