Woven wraps are available in three sizes - size 4, or shorties, which are great for quick wraps with toddlers or for quick trips, size 6, the standard size used by most people, and size 7, which is the recommended length for people over about a size 14 who want a long wrap.
What size wrap do I need?:
Wraps are most commonly referenced by their Didymos size equivalents:
Most people start with a size 6, but if you are plus sized then a 7 is a better option. If you find your wrap is too long for you, you can always have it hemmed down.