My 11 month old is not crawling yet. Instead, he scoots along on his bottom. He looks as though he may go straight to walking. While I am pleased that he is making the effort to move independently, I have heard that an inability to crawl can signal possible learning disabilities. Crawling is not a true milestone because all children do not go through this stage.
Many babies start crawling between seven and ten months of age.
This may come in the form of the typical forward alternating movements of the arms and legs. Others may be more adept at traveling backwards primarily because their arms are more coordinated than their legs. However, the drive to move about and experience the world is a strong one. Scooting on the bottom, sliding on the knees, moving sideways and rolling about on the floor are all effective ways to venture out. If you look at most formal developmental milestone and learning scales, you will find that crawling is left off of them.