Headscratchers / Tin Toy

• Tinny isn't age appropriate for Baby Billy. So if he was just purchased and unboxed, who was he for?
• Where are Billy's parents? He falls on the floor and cries, and nobody comes in to help him. (I know it was already hard animating Baby Billy himself, and adult humans would have been tougher with late 80s CG, but that's not the in-universe explanation)