Note: Many mothers want to buy a larger size so that the baby can wear it for a longer period, but the sleeping bag is originally loose, so they will get an inappropriate size. In order to avoid this situation, mothers should choose the size suitable for the baby according to the size chart. Two-way Zipper and Neck Protector:Our toddler sleep sack with legs has the smooth two-way zip for easier diaper changing and bathroom visits. Zipper covering keeps baby’s chin from scratching. Special design: The sleeves of the sleeping bag can be disassembled freely as needed. It can easily cope with the alternation of cold and warm so that the baby is not easy to catch cold when sleeping. With 20 percent more leg space, the baby won't feel too constrained when he kicks and rolls over. Always Keeps Warm: 2.5 Tog Sleep sack for baby, suitable for spring,autumn and winter, temperatures 16-20 ?/61-68?. After the clothes are washed, the soft polyester fibers used as fillings will not clump together or move to other parts,keeps body inside always warm.And the trousers and cuffs are lengthened to block out cold air. Super Soft Cotton fabric: Our baby sleeping bag is made of super soft cotton. Safe,comfortable and skin-friendly. Sweat-absorbing and breathable wearable blankets keep toddlers comfortable without overheating. Easy to wash and dry, no need to worry about shrinkage and deformation after washing.