[fivefifty]

This is correct, you don't need animal products specifically to get the height increase it's more about just getting a decent amount of protein along with associated vitamins and minerals for the mother during pregnancy and through the childs early life up to early adulthood.

With animal products it's basically just easier to reach this nutritional point at least when compared with more traditional plant based diets. Of course with modern plant based supplements and nutritional knowledge and food availability etc. you can more or less narrow the gap these days at least in a technical sense, but sometimes in the real world the problem can be getting the kids to actually eat enough protein if they are fussy eaters who decide they don't like a particular protein source (whether animal or plant based) or are filling up on nutritionally sparse junk food first.