Barring any structural or cognitive disability, most human babies take their first independent steps between 9 and 18 months old. This is considered the "normal" range. There's nothing wrong with a baby who starts working earlier, though. They cannot hurt themselves by walking too young. A very young baby learning to walk will be considerably mobile than he was before (even if he seemed like a champ crawler or bottom-shuffler). So he will need protecting from his own ignorance of the world.
Most babies who don't walk until after 18 months don't have anything wrong with them, either. Some babies are just not too bothered, or may indeed be champion crawlers. However, if your baby isn't walking by 18 months, it's worth having a word with your health visitor to get a referral (to a pediatric consultant) into the system. By the time you get the appointment through, your child will probably be toddling about, anyway.
Most babies who don't walk until after 18 months don't have anything wrong with them, either. Some babies are just not too bothered, or may indeed be champion crawlers. However, if your baby isn't walking by 18 months, it's worth having a word with your health visitor to get a referral (to a pediatric consultant) into the system. By the time you get the appointment through, your child will probably be toddling about, anyway.