Single mother...

Ma

Ok so I’m currently 29 weeks pregnant and the dad isn’t around much, He wants to be involved but lives with another female who’s been buying our son baby stuff and I don’t know what else. They live in a house together with her kids and children father apparently lives there too. I have a feeling my sons father is going to ask to take him overnight when he is born, But I plan on breastfeeding and I’m not sure how that works. There isn’t a agreement on who has rights him to either way but I feel he’s going to be to young to travel when he first gets here..what are my rights ? I want him to be involved but no think he can just take our son when he wants too..