L.A.
Hi Melissa,
My daughter is 2 years old and we still use the wedge. We put it under the sheet. We used it when she was a baby because she had GERD, but we just kept it in because it works basically like a pillow! I do remember when she was younger that she rolled all over the crib and it didn't do much good at that time. But, it works just fine now. I don't think there's a specific time that you have to quit using it...it's totally up to whatever works for you and your baby! Hope this helps!