Happy Birthday for yesterday OP! it sounds like he is normally good at celebrating your birthday, so I'd be worried that there is something else going on.
I don't want to be a downer, but some men struggle with the new dynamic of having a child and start to feel jealous and resentful of the attention you give the child, and not to them, it's ridiculous when you think about it but I've seen it happen with my own eyes, obviously a child that young needs your time and attention, so it's nothing you are doing wrong and definitely shouldn't change anything, but it could be a sign of a deeper problem that hasn't quite come to the surface yet.
I hope he was just thoughtless on this one occasion, but I think you should keep an eye on it, the person I'm talking about used to use very subtle ways to 'punish' his wife for (his words) 'pushing him out', he'd ignore her when she was talking or be dismissive in tone and conversation, nothing too bad in the grand scheme of things but what has happened here, him choosing to work when he doesn't need to, at the last minute too so you don't make other plans, and 'not getting round' to doing your cards, which is a bare minimum to be honest, just reminds me of the petty bullshit he used to do all the time to make a point to her, that if she was going to 'neglect' him, he was purposely going to 'neglect' her.. it was horrible for her as she had done nothing at all to deserve it and couldn't do anything to change it.
I really hope that's not the case, but you should think about mentioning how disappointed you are at his lack of effort to give him chance to buck his ideas up, and definitely keep a close eye on things.