I stand by my initial statement. If someone came up to me, assaulted me (pushing), tried to steal my car and thus kidnap my child, they would be dead. That is defense of me (a vehicle can be a weapon) and my child.
Unless I read you completely wrong, which has happened before.
Now you are trying to stretch the rope. (defense of self and others). This is an incident where you would be defending others, their five month old child. That’s an entirely different situation than if it was your child. Your child, it would matter at all if you understood what language the criminal was speaking. He attempts to kidnap your child, BANG. Collect the body.