Nicotine is the primary ingredient in tobacco products. Nicotine in medical products is used to aid in smoking cessation. Using a controlled amount helps reduce nicotine withdrawal symptoms when you quit smoking.
When to Expect Crawling to Begin. Babies typically begin to crawl between 6 and 10 months, although some may skip the crawling phase altogether and go straight to pulling up, cruising, and walking. Help your babe get ready for his crawling debut by giving him lots of supervised tummy time.
Babies can be sitting from 6 months, Crawling from 4 months and walking from about 7 months. Your baby will do it when he /she is interested enough. Don't worry about what other babies are doing. The  normal  range stretches a long way.