How old should I let him go overnight with his daddy?

So I'm due to have my son in January and the father recently bought a crib for his house he is building, I'm thinking he will want to keep our son over night once he is here, although we are not married I still want him to be involved with his life, He has a dog and right now lives in a camper beside he's parents. I plan on breastfeeding the baby and I'm not sure how to share him when he's still so little, What is a good age? I'm a single mother and I know that I have 100 💯 rights as of right now but need suggestions