I think it is a good idea to find a store with a good selection and try some on with your baby in them. I found that my baby became too heavy for our ring sling around four months. I bought a Moby without trying it out first and I hated it. For me, it was too difficult to get my baby in and out of it, and he never really liked to nurse in it. A lot of moms love it though, so it's something to try. Although I used it on occasion for going out, it got uncomfortable for carrying my baby around at around six months. I love our Ergo. I'm still nursing my 13 month old in it when we're on the go. I love backpacking him around in it too. But that's just what works for me. It's worth trying some on before you make a decision.