Have 2 DC, would not want to be child free at all, but, in hindsight, and if I am being really honest, I would have preferred to have had my kids when I was older (mid 30's), instead of spending my 20's with the responsibility of children and all it entails. We should have been saving for our future, doing impromptu things, blowing our money on clothes, holidays, nights out, lazy weekends in front of the TV, frivolous stuff, whatever.
I tell my sister to not even think of having kids before she is 35 (despite the warnings about fertility decreasing), but once you have kids you will always feel a responsibly to them, you will never be able to guilt free put yourself first. I will be telling my DD the same, We really wanted kids, but now I wonder why we were in such a rush.
I realise it may seem a bit shallow tbh, but we missed out on what could have been a very carefree decade, where we had money to do things that we could not do with kids, things that we are not interested in doing now but would have been fun at the time.