Regression with new sibling

[Armdjm]

Really just hoping for some advice/peoples stories here..

My little girl was 2 in February and has been potty trained since about May/June. I had another baby in the middle of July and when she first came home my toddler for a couple days had the odd accident which felt purposeful then she stopped after a couple of days and we’ve had no accidents since. Baby is now 10 weeks old and for the past maybe 10 days she keeps weeing in the car every time we go out, only on the way home, never on the way somewhere. She is doing it completely on purpose and when you ask why she just says she ‘has to’ and finds it funny.

On Wednesday this week she was at home all day and just kept wetting herself, again on purpose, thinking it’s really funny. Then had 2 days at nursery with zero accidents and then today has wee’d twice this morning on purpose again thinking it’s really funny.

I know a regression is common with a new sibling but I’m just so lost on how to deal with it! We’ve tried telling her off, ignoring it, calmly telling her not to, reward charts. I just don’t know what to do! It’s so hard because both of our car seats are just ruined.

edit just to add - she doesn’t wee at nursery, when we’re out at places, at other people’s houses, or actually so far upstairs in our house. It is always in the car as she sees us approaching home, in her chair at the dining table and in the corner on the floor in the living room

Well the most obvious answer is that she is seeking your attention. Is there specific issues around getting out of the car or meal times that might mean your focus is elsewhere? Short term she’s your tried putting those puppy pads or similar in the car seat? And on her chair? Will
at least stop the damage!
Other than that I’d suggest you react as little as possible. Hopefully she’ll slowly stop!

@Smartiepants79 nothing in terms of coming home I think she just knows not to do it on our way somewhere as she doesn’t have accidents when we are out. I fully assumed it was for attention but today she has done it constantly while I have been 1 on 1 playing with her and just laughing when she does it! Hopefully it will stop soon! We bought some of the washable pads for car seats off amazon but they don’t protect it much at all so going to start using puppy pads!

It does sound like she’s definitely looking for your reaction. You need to stay as neutral as possible. Make it boring. Make her help clean up.
Make sure you try your best to give her as much positive attention as you can manage outside of this.