Usable from 7 months old (when the baby can sit up steadily) - Up to around 1.5 years old, use as a lap belt by wrapping around the adult's waist. - Up to around 2.5 years old, use as a chair belt to prevent slipping in places without a baby chair. Can be used for a long period of time. Can be washed in a laundry net. There are no major stains or damage, but there is a feeling of use. For those who understand that this is a used item.