although I also have a problem with the concept of children being "gender non confirming
Yes, I agree. Also, kids tend to copy their parents and gender roles are less clear cut than in the past.
For example, I know a few stay at home dads. In my experience, cooking is shared pretty evenly among couples my age (thirties) whereas among my parents' generation, the women do about 90% of it. On the Tube I hear a lot more female train drivers making announcements than I used to.
So, if a little boy wants to wear a baby carrier with a doll in it (because his dad carries his baby sister that way) or play with a toy oven so he can make a casserole like his dad, or a little girl wants to be a train driver like the lady she heard on the Tube, do such activities still count as 'gender non-conforming?'