Pitbulls

Before I ask i dont want peoples negative comments because I'm just looking for opinions . My fiance and I have 2 pits one is 4 the other is 1 1/2. We have had them since they were 8 weeks old they ate awesome and good with kids. However they have never been around a new born I'm due in December I was wondering how can I introduce them to her I know letting them smell her stuff but when I bring her home. And no she will never be left alone with them they are good boys but I'm smart enough to know things can happen with any dog.