Crawling occurs after 7 months, crawling through the baby you get to know their environment, some omit this step and go directly to stand and then walk, which affects development, because the crawling favors the view , touch, speech, balance, orientation and perception and strengthen muscles.
Some kids are moved by dragging its bottom sitting and bending the legs, but others move on his belly with the help of his legs and hands. Do not worry about how you do, the important thing is that you feel comfortable doing it and learn to navigate. And Down 12 months from start to stand up and begin to take their first steps.
Crawling through favors the evolution of the brain, the kids who have not crawled tend to generate problems in overcoming difficulties both relational and affective-motor, to crawling is favored future connections between the two hemispheres of the brain and connections depends on the development of cognitive functions and more complex movement.
On the other hand developing vestibular and proprioceptive system which let you know where the parts of your body. Develops visual convergence and enables the focus of the eyes, according to studies by optometrists, 98% of kids with strabismus crawled not necessary.
Cortical opposition also develops, which differentiates the plane where the head, palm of the hand and the brain learns the thumb opposes the fingers which helps to develop fine motor and things to take place eye-hand relationship favoring good handwriting and writing.
Lateralization and helps establish that connect the two hemispheres, a baby not crawl if you want to reach an object using two hands, instead of crawling, if that difference each hemisphere and can choose the most convenient hand to catch the object.