Mobility Patterns are fashions in which the brain moves arms and legs in order to move the body from point A to point B in a given floor.
Humans have basically 2 mobility patterns:
Homolateral and Cross (bilateral)
All forms of human mobility (creep, crawl, walk, run) must end up using a perfect cross pattern, where the first two forms starts with homolateral pattern to graduate days ahead in a creep and crawl in a perfect cross pattern fashion.

If a person (baby, child, adolescent or adult) is not capable of cross pattern creeping or crawling, it's proof his/her primitive zones of the brain (central nervous system) is not well or sufficiently organized, thus, incapable of perfect movement, thus, incapable (partially or totally) of many different abilities spread out in the social-intellectual-physical arena.

In other words, making sure your baby has plenty of floor time with plenty opportunity to move around facing upside down, and plenty of reasons for moving, that will promote your baby to move from A to B, and that by itself should take care of the rest of the abilities, making them to appear sooner than typical (known as a early developmental program)

As long as we parents make sure our babies belong to a clean, warm, safe and loving floor, full of reasons to frequently move around, nature will take care for ALL THE REST OF THE HUMAN ABILITIES to appear right on time.

NOTE: in order for a baby to move, he/she has to be upside down without any interference between floor and skin, so perception (incoming information into the brain: touch, sense) is much clearer and intense, thus, expression (outgoing information from the brain) is possible in quantity and quality. Reason why is always important to avoid as much clothing in arms, legs, hands and feet.