What do I do?

Honestly I don’t know how word anything together my mind is all over the place so I’m sorry if anything is confusing but I don’t know what to do about my partner. We recently had a baby boy and since my son has been born my partner hasn’t really been helping and when he does “help” he complains or acts like he doesn’t know what he’s doing. My son is 4 months old btw so you would think he would know to do the basics by now. His excuse is he’s always working. Even on his days off he would rather play his game, go to the gym, or hang out with his friends. It’s like he has all the time in the world to be doing all that but when we do spend time together it’s for about an hour or 2 and then he leaves to do whatever he says he’s going to do. But it’s like he rushes the time he spends with us and spends the rest of the day out doing god knows what. He does love our son don’t get me wrong but it’s like he doesn’t want to take responsibility. He is responsible when it comes to getting out baby things but that’s mainly because I tell him to get it. And if it’s not me telling him to help out with our baby or to get our baby something it’s his mom. His mom helps me out more with my baby than he does. I’m grateful for what he does do when he helps but I just wished he didn’t complain, makes me do it anyways or acts like he doesn’t know how to do anything. I love my son and I don’t have a problem doing everything for my son but I also need a break once in a while. I want to be able to catch up on sleep. I don’t even want to go out anymore I just want to sleep. I want to be able to rely on him and now his mom for help. I’ve been feeling kinda sad recently about this. I feel like no matter how many times I talk to him about this it’s not going to change. Because it’s not like I haven’t talked to him about how I felt I did. But he always says he will help out more and spend more time with us and like I said when we do spend time together it’s rushed. What do I do at this point? Someone please help me because I swear sooner or later I’m going to lose my shit.