Dear miumiu mama..
Certainly Baby can be carried by baby carriers.. but you have to choose the one with that features that for infant to lay down and buckle at your back, then baby is holding in front of your stomach, below your chest, above your tummy.
For the snugli, baby bjorn.. they do have some style provide certain protection for infant who doesn't develop their own back support.
both this 2 brand names have many style for you to choose from.
-------------------------------------------------------- Baby carrier website at babyuniverse
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Website above, you can go in and have a look, compair the feature bewteen them.. then go to the local store and search the one you want...
certainly, choose one which can face inside and outside, then you can still use it when your baby gets older than 4 months, as your baby would like to see the world.. also when you carry her and take the public transport like bus, and MTR, you can sit down without un-buckle the lock. very convenience.