By the age of three, most children are old enough to leave the high chair and sit by themselves. That's where the BabyBjörn Booster Chair comes in. It is the perfect solution for helping your child to sit at the table at the correct height. The BabyBjörn Booster Chair can be fixed onto most chairs and will quickly become your child's favorite place to sit, both at home and away. It does not leave any unsightly marks on the seat or cushion of the chair being used.