Moot

You need to unlock their spa skins to defog the characters. Spa skins can be obtain by doing the midnight parade and other various ways.

Okay

The one you have clearly visible is the first child ever that you send to baths. You get one respective spa skin for free.
When you get the second or consecutive spa skins, those get converted to chunks of spa xp for that child, though that xp has to be applied manually while the child bathes. Spa xp isn't shared or transferred between copies of a child, so minmaxers would keep those xp suspended in case Christmas-scale events of Lisa's Extra Lessons get you a maxxed-out new copy of a child. That one you can bath until it cooks.

Thank bro for the tip

Really I want them all nake