Originally Posted by pek64
There is controversy around swaddling. Studies of facial muscles of swaddled babies show distress. Lack of crying is not the same as happy. And the baby may tire after struggling to get free, and you may not be able to see the struggling.
The theory on swaddling (as I understand it) is that the firm resistance to movement helps the baby calm down. Harvey Karp (The Happiest Baby on the Block guy) describes this as "activating the soothing reflexes", I mostly notice that infants have very poor motor control, and are likely to disturb themselves by flailing around when they have all their limbs free.
In any case, when swaddling works, it works much the same way that wrapping your baby up in a wrap-style carrier works. A Moby provides the same containment and resistance that a good swaddle does, with the added benefit of proximity to a parent (which is great, but not practical for every activity or every parent). Some babies love being worn, and it calms them down handily. Some hate it and flip out. It does, however, strike me as really odd to tell a parent to wear the baby! get a Moby! But don't swaddle.
It is not my experience with infants that they are quiet when they have complaints about the service. A distressed infant is going to make noise. (There's a common claim that babies who aren't rescued immediately when they cry go silent, believing that they are abandoned and have to hide from wild animals. This is, IMO, a lousy survival strategy for an infant in that kind of desperate, primitive situation, and not consistent with my observation of my own kids, who, when I didn't respond fast enough, shifted into a mode we called "scream so the rescue copters can hear you.")