関連ワード:  when does the kneecap develop    when does the patella develop    when.does.the patella.develop in.children    when does the patella develop in.babies    when is the kneecap develop    when does the kneecap fully develop    when is the kneecap fully developed    when does the patella fully develop    when does the patella bone develop    when does the patellar reflex.develop