Update! Fun little facts... Remember Piaget's idea of Object Permanence compares 10 month olds vs 12 month olds....

Most babies take their first steps sometime between 9 and 12 months and are walking well by the time they're 14 or 15 months old. 

Most babies learn to crawl between the ages of 7 months and10 months. Your baby may opt for another method of locomotion around this time, though – like bottom shuffling (scooting around on her bottom, using a hand behind and a foot in front to propel herself), slithering on her stomach, or rolling across the room.