How do you convert an all in one car seat to a booster?

When should a child move to a backless booster?

Your child is ready for a backless booster when . . .

• Your child is about 5 or 6 years old.
• They can sit still without leaning forward or to the side, slouching, following around, etc.
• Your child is at least 40 pounds.
• Your child is at least 38-43″ tall.