I LOVE the Ergo Carrier. I seriously use it two to three times a day for Faye. And Claire can use it too. With infants you put them in front and toddlers can go in front or on your back or on your hip. It's sweet. You should look at them online. I'm obsessed. They're like $100.
I don't have the Ergo one, but it seems cool because I see Erin with it and Faye is so small and she can be in it already... I have the baby bjorn which i like but you can't really use it until they can fully hold up their heads or else their little faces are smashed in there and I'm constantly checking to see if they are breathing. I also have a peanut shell sling that I got with Owen and it's alright but I'm still always checking to see if he is too smashed in there. The sizing goes by your weight and the weights are on the actual package so you would have to look at them to decide which one. Between the two I would say I like the Bjorn better.
i have the peanut shell sling :)
Thank you all for your comments!
Just had to add, that we also have the baby bjorn, which is james' and he gets to be the one to carry emerick around in him when we finally get around to using it. I think the peanut shell is great, but I have honestly only used it once, emerick is too heavy for me to carry him in it, you are probably having a 9 or 10 pounder too, so maybe just invest in the bjorn instead of a sling ;)