My DP has two children. We have now lived together for a few months and they have built up to now staying with us 2-3 nights per week. It's all going really well. DP obviously does all the parenting, but I join in playing with them, we have trips out together, I sometimes read stories, etc. I am very fond of them - they are great kids.
His DD is about to turn one. We have them the evening before/morning of her birthday and we are then going to their mum's for a party, cake, gifts and all that midmorning. Would it be weird if I got her a small birthday gift? Would it be weird if I didn't? DP thinks it's a great idea, but I don't want to annoy their mum. What do you think? If yes, what kind of thing would be appropriate? Was thinking a pull toy or sth like that maybe?
(For context. DP and ex coparent well. Ex and I don't see a huge amount of each other but have met several times and get on well. I would really like to keep it that way, hence overthinking this stuff. And before I get jumped on - I am not the OW. His ex broke up with him early on in 2nd pregnancy - no cheating, etc).