I refer to my 16 year old daughter as “largish Child,” because when she was younger she towered over the other children, especially the boys. She was so big, comparatively, that she played full contact football when she was 13.
But then she stopped growing and thinned out and picked up swimming (since I wouldn’t let her continue in football after we moved to Hawaii) but “Slightly Taller Than Average” girl is a mouthful, so...
We have a Tallish Child as well. Our 12 year old daughter is now the second tallest person in our family (I’m 6’5”), a source of much consternation for her older sister. :)
I grew up with a bigger younger sister. She's 6'3" and I am 5'10"...she also hated all sports involving balls.
You can imagine how that turned out...