Boyfriend just had a child

So I have recently been seeing someone new who had been completely honest about his ex being pregnant. It has been a few months since we got together and I was okay with the idea of him having a child on the way. But now that it has finally happen and his daughter is here I am not too sure how I feel about it. I understand things are going to be totally different with us but not at the same time. He’s at the hospital now and is staying the night 🙄. I’m really not a jealous type but I just feel off today. He jokes about marrying me but it doesn’t seem like a joke as he has told me he is falling in love with me. I really don’t even know why I’m posting this or what to say. Any words of encouragement would be nice. But also honesty as to how you would feel about the situation.

Thanks.