If he's going to need retraining, it won't do to protect your girl.
It's about getting him to move away from you and respect your space at all times. @Beekissed has a very good article about it here.
Human aggressive roosters tend to start small, and go after smaller humans first, then...
He's growing up, and that action towards your child sounds bad to me, if I understand what you mean by the 'drop kick' behavior.
He can easily reach her face!!!
Mary
To add to this; she was being polite, and he wasn't.
I agree with what's already been said here. Your child's safety in the most important thing.
If you are hand feeding, stop, and have your three year old on the other side of the fence, at least. Children need to learn how to behave out there; no hand feeding or running around, or yelling...