I know of the Impl K.I.D and I have a chibi unoa, but I'm wondering if there are more body sculpts similar to them? I suppose gender neutral bodies are more likely to have this younger look, but most of the time they are too big for me.
I am not sure what size you're looking for, but for perfect children dolls I love Dollstown and Volks MSD dolls. For someone a bit smaller for fall thin parents, Dollshe has four kids around 31cm talk that are very child like.