Swaddling has become a bit of a controversial topic these days. Some people and professionals are still using and recommending this age-old practice, and some have done a 180 and turned completely against it.
Historically, swaddling has been used all over the world, in various cultures, for thousands of years, with the goal of calming a baby, and reducing night wakings by promoting a deeper sleep.
We live in a sensory-rich world. Everything we learn and take in from our environment comes into our body (and brain) through our senses, and once the brain has integrated or processed this information, we act on it. Sensory processing is the ability of the nervous system to register input from our senses, interpret the information, and form a response (either a motor response, language, cognition, etc).