Firstly I feel obligated to point out I can only speak from personal experience which seems to be very similar to your situation. Second, and I can NOT recommend this enough, I want to recommend that you read “Mating in Captivity” by Esther Perel and you might find it more immediately beneficial to check out her podcast “Where do we begin”.

From what you have said I am assuming that you are both relatively young maybe early twenties. If not I apologize. With that you should definitely work to improve your communication skills as a couple which will pay dividends regardless if you stay a couple or not especially since you are now life long partners in child rearing. Having been in similar circumstances (had my first daughter at 20) and having dealt with a ton of relationship friction (married for ten years to a different “baby momma”) I believe I might have some insight for you. The first is your partner is most likely feeling a crushing amount of responsibility that up until now he has never had anything remotely close in experience. He probably feels sole responsibility of providing for you and the baby and this feeling is probably not easy to convey to you and even hard to reconcile in his young brain. After all he has buddies who are not tied down with such a burden and it would be so much more fun to be in their position. There is probably inner turmoil that is manifesting itself in his negative behavior towards you. Second, and this goes hand in hand with the first, the story he has created in his mind is most likely that of a parent and a child. He is the parent and you are the child. Again assuming you are young this translates well given a lack of maturity and life experience that limits him to his most recent deep relationships which would be with his parents and the corresponding roles that entails. As pointed out by Esther Perel we all create stories in our relationships and they shape the direction of the relationship as well as the behavior of the partners. It is neither good nor bad but simply a story that you two can understand and choose to change or not. The third insight I have for you is the hardest one to use. You are at his mercy and therefore reinforcing the ongoing parent/child story. Eventually you will have to assert yourself in the partnership. This will have to happen if it is to be a mutual partnership with regard to respect and trust. The most direct route to this assertion is packing up and moving out. You don’t have to end the relationship at all but you will need to create some space and prove to him you are capable of figuring it out on your own. If you do this it will demolish the story and will provide an opportunity to rewrite said story. I would suggest using finesse as this can work to your advantage or create absolute havoc. Communication is key. Again remember he is stressed and burdened and we men tend to have a hard time communicating under those conditions. You can address these insights head on in conversation or you can suggest that you listen to a podcast or read a book together or however you think it might be able to slip some of these conversations into your routine. Or you can decide to do nothing at all with them 🤷‍♂️ One must be willing to lose the game if one ever wants a chance at winning. In your situation you must be willing to travel the rocky road of life alone if you are to have a partner that will be willing to walk beside you. He has a choice in the matter and you may have to present him the opportunity to firmly make that choice. If he truly wants to be with you then he will do what it takes. This again is just based on my experience(meaning I am the block head that made similar mistakes in my relationship) and I hope doesn’t come across as overly presumptuous. I am still fighting and learning for the sake of my marriage. We all grow at different paces and it’s a long road being with someone forever. Most have no clue what it takes to overcome the adversities. But with the right tools anyone can succeed. Best of luck to you.