The front reinforced torso carry carries your baby on your front or hip, and works for all age of baby from newborn to pre-schooler. It is similar to the traditional hip carry but it has an extra layer of fabric passed around your baby (which 'reinforces' the first pass). It uses a short wrap, usually a base-3 size. You can work out your base size here https://firespiralslings.co.uk/2017/12/29/what-is-base-size-when-working-with-woven-wraps/