system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
When does baby start crawling?


assistant
There is a wide range in terms of when babies reach this development milestone. At 6 months old, they may start to rock back and forth on hands and knees, and by 9 months, they start to creep and crawl. However, each baby has their own timelines, and it's not uncommon to see babies skip crawling all together.