My 4th month old literally just showed signs of aggressions by growling and barking. We just took her home from daycare and she was sleeping. My wife started to cuddle with her and she growled and let out a lunging fake bite bark. I proceeded to come over and start annoying her, she did the same thing. I grabbed her by the neck and put her down but she still fought. First time we have ever seen this. She is usually docile and has never exhibited this behavior.