The shoulder straps are adjustable, so I think it can be used from around age 3 to around age 4 (approximately 85-105 cm). When going to the toilet, you can lower the shoulder straps, so it's not a problem. I think it can be worn regardless of the season (^^) Short denim overalls, a casual and easy-to-move-in design! For those who love denim. - Design: Denim overalls - Number of buttons: 5 - Number of pockets: 2 Thank you for viewing.