If we place our baby down at a time when they are working to crawl, for example, but they are wearing a dress that catches their knees, then we have added an obstacle for them.
In the womb, babies have free access to their hands and feet. Instead of immediately swaddling baby down, covering their hands with mittens and feet with socks, we can skip those restrictive clothing items all together. The outfits we choose throughout all stages of their motor development should be practical and properly fitting. Non-restrictive clothing minimizes frustration with their first movements and sets them up for success with respect to freedom of movement. If we place our baby down at a time when they are working to crawl, for example, but they are wearing a dress that catches their knees, then we have added an obstacle for them. Too many obstacles can lower their self-motivation.