What should I do about my dog showing aggression towards my baby?

buy a muzzle and put it over the dogs mouth that way he won't bite her or bark he can't move his mouth. you should put the krate in a bedrom shut the door if he gets out then he wil just be in the room and won't hurt anythingg. or you can put a bunch of pennies in a coke bottle and whenever the dog is being aggressive shake it...the dogs hate the sound, it worked for me.