I want to buy an old watch band. Is it better to buy a wide one or a narrow one?

According to the principle of ergonomics, the extra-wide shoulder strap and the extra-wide belt balance and share the weight; Unique detachable headgear design can effectively protect the newborn baby's head, but also play a role in keeping warm, windproof and shading. Material: pure cotton knitted fabric, pure cotton lining. When the baby sits on the strap, the design of the strap can make the baby's spine grow healthily in the right posture.