Swimming pool changing rooms are the same, just take them in the changing room based on the gender of the parent. Simple.
Sometimes the guys at ours moan a bit about older kids (5 or 6 yr olds, there’s an age limit which is 8 I think) pointing at people’s willies and laughing, but frankly if you’re worried about anyone looking at your cock, you could always use the cubicles provided and shower with swimming stuff on (at ours in the gents changing they have cubicles and an open central bit with benches, but most people use the central bit and just change out there).
In quite a few more modern swimming pools than ours, I’ve noticed that they just have a single large number of cubicles, which seems fine, although removes the social changing room banter thing that a lot of the older serious swimmer types seem to get up to.
The baby change in the ladies thing is dead annoying. If there’s no baby change at all, the ladies is sometimes better anyway, because there’s less likely to be piss on the floor of the cubicles / exciting looking urinals to poke curious hands in.