For 1 Year Old & Up Size designed for young children. Quick installation. The hanger design makes storage easy! The Toilet Trainer can be used on most standard toilet seats. it is easy and quick to install and convenient for early childhood toilet training. The waterproof material makes cleaning easy. Thick soft padding provides provides comfort and protects bottoms. Suitable toilet seat dimensions: Toilet seat hole as measured depth x width: d: 23 to 31cm w: 20 to 23.5cm For hygienic reasons, once this product is opened it cannot be returned.