joke answer: baby landed there after falling off Twin Attacker real answer: he’s just there to show off the Desert terrain, like MeeMee in the Arctic and all of them in Outer Space
The one thing missing from the new games is the funny looking character designs and voices that sounded like monkeys. Sega made them too cutesy. You can use the old designs in Banana Mania but I don't know. It's not the same without the funny voices.