Pit bulls and babies?

Bella
Hi I'm a ftm and I'm 29 weeks with twins. I'm currently still at home with my parents and my SO and I are looking for a place together preferably an apartment for the time being. Anyways he has a pit bul she's unlicensed and not fixed. She is a very sweet dog and I love her. But he doesn't understand that most apartments don't take dogs bigger then 15 pounds. Also he thinks that if we find an apartment with a yard that during the day while he's working and I'm taking care of the babies that we will keep her outside then when he gets home she gets to be an inside dog. How safe do you guys think that would be for new born babies? Aside from being such a big dog, but the dirt and allergens that she will be bringing in. I personally think she needs to be an outside dog all the time, I don't want my babies around all that dirt, shedding hair and allergens. Not to mention how dirty the place would get id have to vacuum everything everyday and clean everything everyday. And that would be my job because my SO would be supporting us. I wouldn't even want to bring her Cus it's just not practical for our situation. But he won't leave her behind with his brother, and he thinks we will be able to bring her to an apartment. Any advice anyone? Or anyone have any experience with new borns and pit bulls?