I would wait but I do think there is a positive side to getting a puppy now. You would have a chance to learn the puppie's personality and habits before introducing your baby. You wouldn't want to get a puppy that you find out would do something harmful to the baby. Also you would get the potty training out of the way before hand and feel better knowing your baby wouldn't have a chance of being around random dog poo in the future

I would either do it now or when the baby is a year old or so. But since you already have 2 I would consider waiting. But not in between. I worry about my dog being jealous. I'm not exaggerating when I say she is my sidekick. She is literally by my side no matter where I go and she's sucha mama's girl!