Babies will usually begin crawling as early as 6 months but may not crawl until 10 months of age.
Some babies will begin trying to walk as early as 9 to 10 months of age and are usually walking really good without assistance by age 14 to 15 months of age.
Although most toddlers begin walking really good by age 14 to 15 months it's perfectly normal for some toddlers to not walk as good or walk until as late as age 17 months.