Walking independently at abt 11 1/2 months old.
Now he's 14 1/2 months old and runs really fast, but he still climb upstairs and likes to crawl under the tables, desks, etc.
We tried to teach him how to walk when he's 11 months old, but he didn't like us holding his hands. But later on, all of a sudden he could take 1 to 3 steps and a few more steps in a couple days and so on.
Well ... don't need to worry! I have a few friends whose babies started to walk independently at around 15 months old.
Some people said crawling will make babies smarter ...