I loved my Parents of Invention Ultimate Baby Wrap Carrier! I no longer use it with my almost two year old, but according to the specifications on the product, I certainly could! And I think my four year old would still fit their weight requirements as well (I have small children!). This wrap is made of a single piece of super soft jersey cotton with two rings at one end. There are 5 different ways this wrap can be worn, but I primarily used it to carry a newborn inward facing, and then when she got bigger I carried her outward facing. Carrying her inward was very secure as you place part of the fabric around her head (hard to explain) which supports her neck without ever compromising her breathing. Carrying her outward facing was fun for her as it allowed her to be close to me but gave her a great view of the world. If worn correctly, this carrier will not hurt your back or shoulders as the fabric evenly distributes your baby's weight over your entire upper body. The wrap comes with a DVD to explain how to put it on correctly. This can sometimes be frustrating at first, but it gets to be so easy. Sometimes to save time I liked to put mine on before leaving the house and would drive with it on, then just pop the baby in the wrap when we arrived to our destination. Super easy to wash, store and carry. And the little pouch on the front is great for keeping an extra binky in. I have tried and used 4 other baby carriers, and this is the only one I would ever recommend.