The Baby K’tan Original Cotton wrap is sized to fit the parent or adult who will be carrying the child (age or weight of child is not a factor). Use our sizing calculator to determine your baby carrier size. Simply enter your clothing size, height and weight. The Baby K’tan should fit snug in order to provide a secure hold. Enter your pre-pregnancy sizes and if you fall between categories, size down. The cotton baby carrier may feel tight at first, but will stretch with use.