I wanted to share a couple of resources, regarding baby wearing and proper ways to carry baby, as well as baby carriers to avoid. When Jackson was first born, we used a Snugli. As a first time mom i wasn't aware of the risks of using certain types of carriers, nor was i aware of how uncomfortable they can be for the wearer! We've come a long way. Not only are the carriers i use now better for baby, they are so comfy, i can easily carry Ellie or Jackson for an extended period (24 and 34 lbs).
We currently use a Beco, as well as a ring sling. The Beco is super comfy, and i can carry them for hours. They can only face in, on chest or back. But this is better for them. I do prefer the ring sling for shorter periods, as it is quicker to take on and off. I absolutely think a good quality baby carrier is an investment in your baby.
A wonderful artcile from the International Hip Dysplasia Institute explains proper use of baby carriers as well as car seats.
Another great article written by a Chiro about proper babywearing. (Note; the author cites at the beginning; "...The gold standard for carrying your baby should be your own arms. In other words, an upright carrier should hold your baby the way your arms would, e.g., facing you with legs in a frog-like, spread-squat position with the baby's weight supported across the buttocks and thighs.")