I'm not convinced that just because whites end up bigger than yellows as adults it means that our babies are that much bigger. We should also be training our waifus from infancy to maintain a 180 degree suspended side split while holding additional weights like Rob Van Dam or Jujimufu. This will give them strong adductors and pry their pelvis open wider while thickening it. In an emergency as americanpregnancy.org
Among humans?