1) The closer the eyes are to the face, the younger the kid will appear. Expanding the size of the eyes will also trigger a more younger looking child, almost chibi/baby like. 2) The nose is less detailed and defined on an anime kid. Use two dots or leave it blank for noses. 3) *For females, and less masculine young males* The chest is underdeveloped, therefore appearing to be a much younger child. For males, the chest is much the same as female, and less wide as a full grown male. 4) The arms are shorter and thinner, also, less defined than an older person. Observe different characteristics of children and integrate them into your drawings.