Teething may be occasionally uncomfortable for babies, but it's an exciting time for parents. According to the National Library of Medicine's Medline Plus site, a baby will start teething at around six months old, but don't worry if they don't appear right away. Some infants don't start teething until around eight months, and others when they are a bit older.
Once baby's first teeth start coming in, you can expect them to appear in a certain order (though this isn't always guaranteed). The two front teeth on the bottom row are usually first to appear, followed by the two front teeth on the top. The teeth on the sides of the bottom front teeth come in next, then the first molars and finally the two teeth next to the top front teeth. Your baby is likely to have all of his or her first set of teeth by the age of three, but knowing what to look for allows you to keep your little one comfortable when he has trouble adjusting.