most infants are able to crawl and speak a few words by the time they are
Most babies crawl and walk within a fairly short time period, but talking can really run the gamut. A baby of 12 months typically says one or two words, although only her parents may recognize them. By 18 months, the average baby says between five and 20 words.
Babies often go backwards before they go forwards. Most start crawling between 6 and 10 months, BabyCenter.com reports. Since most babies are spending minimal time on their stomachs, with the advent of the Back to Sleep program, many never crawl or start crawling later. If your baby hasn't mastered some type of mobility by 1 year, talk to your doctor.