you must feed your baby sully each day. You can`t overfeed a growing tort baby. That means the tort can eat every day as much as she/he wants.
And please don`t try to feed hay to a baby. They need greens to grow.
I put a big pile of food at the feeding station every morning. If there's a lot left at the end of the day I know I put down too much. If it's all cleaned up with no crumbs left over I know I didn't feed enough.
Babies (well, most tortoises) come out in the a.m., warm up, then eat. Then they go back into the hide. They come out again and eat again then hide again. Towards the evening, when the food is starting to dry up and turn crisp, they still come out and eat it.