Babies typically start crawling between 6 and 12 months of age, with the average being around 8 to 10 months. Some babies may begin as early as 6 months, while others might start later or skip crawling altogether and move directly to standing or walking. Before crawling, babies usually need to develop other motor skills like holding their head up, rolling over, and sitting independently. Various crawling styles exist, including classic hands- and-knees crawling, commando crawl (tummy crawling), and bottom scooting. Crawling is not considered a strict developmental milestone since each baby develops differently and at their own pace.