G.B.
In child care the child that had the toy first would have gotten to keep the toy. Chances are though that this would not have happened in child care just like this. Kids of different ages like this are never together in their classrooms.
His toys are totally not age appropriate for him. Her toys should be large enough she can't get them into her mouth or any part of them that might break off can either.
His toys can be completely tiny. They have different toys and baby's are not allowed at all ever into the older kids classrooms. They older kids can move down IF it is the end of the day and they're putting all the kids that are left into one classroom but still, that baby would never move up, the older kids would move down.
So I would have taken the toy from the baby and given it back to him. Then I would have distracted the baby with a ton of other options that should be in that room.
Now if the older child had come over and taken a toy from the baby I'd have made the older child give it back.