I doubt this is "canon", but it'd be interesting if the snake hair required snake food, and the more human baby mouth required mother's milk.
Humans can also subsist on goat's milk, along with wetnurses in place of dear old mom (and of course older babies/toddlers can eat some more basic foods).
Snakes, especially poisonous ones as per medusas, usually eat prey of some sort.
I think it'd be a great image if some of the players were gently nursing the medusa baby with warm goat milk from a wine bladder while others were dangling live mice over her hair.