any of the pre-formed baby carriers (bjorn, snugli, etc) can be very bad for the babies hip development, but in addition to the slings, there are other carriers that are great. a mei tai, ergo, or any of the more freeform, soft carriers, or a moby or maya wrap, anything that keeps baby in a sitting position where his hips are bent, is much more comfy for baby and better for growth. here's a website with tons of options- thebabywearer.com. or, take a trek out to tree city diapers (or check out their website- treecitydiapers.com) in ann arbor where the girls will love to show you how to use all of the baby friendly carriers they have available. the options are endless! have fun!!