Thank you for viewing. This is a hip seat that can be folded compactly. It can be used from around 4 months old, when the neck is stable, up to 20kg. My child didn't like baby carriers, so I only tried it on once at home. I purchased it 3 years ago, so it's not the latest model. I bought it at Akachan Honpo, so it's a genuine product. ★Age guide for carrying positions Facing inward (tummy to tummy): From when the neck is stable to 48 months (up to 20kg) Facing forward: From when the hips are stable to 48 months (up to 20kg) Hip carry facing inward/forward: From when the hips are stable to 48 months (up to 20kg) ★User's waist size Approximately 60-110cm. Men can also use it. Please understand that this item has been stored at home by a private individual. Thank you for your consideration.