This is an ergonomic buckle carrier, It can be used from newborn from 7Kg up to 20Kg (from 5/6 months depending on size and/or development of the baby). This carrier is very very light and can be packed away in its own bag so it's ideal for holiday or hot weather.
How to video
Leighton Buzzard & District NCT Sling Library
https://www.facebook.com/LBslinglibrary/
https://www.facebook.com/LBslinglibrary/