you got adopted by Bruce you were an infant every night your father leaves for his superhero duties while you stay in your crib, Alfred mostly doing a parents work, cleaning, feeding, and bathing anyways so it's like Alfred's your dad but you're always the multimillionaire's toddler son

one night Bruce walks up to your nursery hoping to bond with you after a long night of fighting crime

"ah. There you are how's my little bat doing?"

he said picking you up while cradling you in his arms