It can also ensure they don't wake themselves up with the startle reflex. So if bubs sleeps well and is happy unwrapped and the startle reflex doesn't wake him, then no need to swaddle.
The same can be said for most parenting 'rules'. Certain things are rules as they generally work for most babies, but if something you do in any respect, doesn't work, try something else.
Pregnant for the first-time?
Not sure where to start? We can help!
Our Insider Programs for pregnancy first-timers will lead you step-by-step through the 14 Pregnancy Must Dos!