Where does “παιδ-” come from?

παιδ- (Greek) comes from Greek παιδο-, from Ancient Greek παῖς, from Proto-Hellenic pā́wits, from Proto-Indo-European péh₂wids, from Proto-Indo-European peh₂w- — few, little; smallness.

παιδ- (Greek): Alternative form of παιδο-