Anyone told the school they are taking children out for holiday?

[LifesTooShortYOLO]

So we have two holidays that have been re re re re booked 😂 One abroad and one uk break, one meant to happen in 2020 and the other just before the last lockdown this year. They e been moved 3 times now 🤦🏻‍♀️
My Dd starts school in September he just turned 4 this month.
My plan is to ask/inform the school that we have these breaks now booked for December this year and February next year but I'm really worried how they will react. I mean they aren't going to have a party about it are they but with everything that's gone on I was hoping they may be a bit understanding? I don't know how best to word it?
I don't know whether to let them know once he's started on sept or now?
Any help or anyone who's been in this situation greatly appreciated 😊
Thank you

Yes, I've done it twice and they really didn't care. Once was a few years ago (pre-COVID) as it was the only time we could book that worked with my and dh's work schedules. It's hard for dh to take off in the summer because it's very busy. The other time was last September and I'd just messed up the dates because I was so stressed and overwhelmed during the first lockdown and read the school calendar wrong (thought I'd booked for the last week of summer holidays, but actually it was the first week back). It counts as an unauthorised absence, but they were really just like, okay, thanks for letting us know.

I would just let them know a couple weeks before. He won't even be on the register yet, so they won't want to hear about it now.

They may disapprove but can't do anything in terms of recommendation of a fine as he won't be 5.