Cause he was trying to compete with Araki and Takahashi. Toriyama is a fairly shortsighted creator and never really seemed to look at long term story telling or worldbuilding.This would be dope if they introduced more babies that survived the frieza attack... but as of now toriyama hasnt even brought it back up...or touched on it... why even make this huge big story arc of the babies and dont bring it up again???