Baby Outdoor Play Yard

My 3 year old female cat is very gentle with my wife and me, but is aggressive with guests who come to visit.?
We adopted in a shelter at about 6 weeks. To my knowledge it has never been abused in any way. We never hit or scare him. Her people, even to the bait in time, showing her belly as she wants to cuddle and swating or a whistle with them. I never played very rough with her. My wife says I have spoiled her and why she is like she is. I've had cats before but have never acted like that. We are expecting a baby in October, and my family is concerned about the situation. It seems to be very territorial. She goes out into the yard but it is not an outdoor cat and is very threatening for cats next door, hissing and watch. them out of court if They sometimes walk through when it came out. Why is it that way. We did not get to be like that.
Well you should really watch her closely when the baby arrives, you might be surprised how sweet it is. My cat is the same way. She loves me and tolerates my husband, but almost everyone hated, which made me very nervous when my son arrived. But she avoided roughly during the first six months or both, and now she loves it! Introduce the cat to the baby slowly and never leave them alone until Are you sure the cat is in agreement with the baby. Might want to get her velvet paws at the vet so that she can not claw him. But I think it will be fine.
Baby Pygmies at Coulter Farms