You can adjust the sling while you are wearing it by pulling on the tail or sides of the tail. You also have the tail to shade baby from the sun or use as a cover while nursing. The sling is a good choice if you plan to share it with loved ones of a number of different sizes because it has such a wide range of adjustment. Rockin’ Baby Slings can be worn in five different carrying positions to match baby’s mood and development, from birth to around 3 years of age or 40 lbs. They come in the original size which fits most body shapes and sizes and in xs for those who are especially petite.