New baby and jealous dog

Li

I’m not sure if this is the best place to post but I had a question about recommendations regarding our new baby and dog. We have a 2 year old Pomeranian/Corgi mix. She’s been with us since a puppy. She’s very protective, especially with people coming to the house. She also is not a fan of our small nieces and nephews; especially when they hug her. She will growl at them, never bit them. Our son is 9 weeks old and she has growled at him a few times; hasn’t attacked either. It’s often when we are feeding, playing with or holding the baby. We are trying to make sure she gets attention and loving too. But nothing has really changed. Any recommendations on how to make her feel more comfortable with him or feel less threatened by him?