The 2 carotid arteries on each side of the neck are the most important because they supply blood to the parts of the brain that are involved in thinking, movement, sensation and speech. The other 2 arteries that bring blood to the brain, called the vertebral arteries, supply the brainstem.
The vast majority of babies sprout their first tooth when they're between 4 and 7 months old. An early developer may get his first white cap as early as 3 months, while a late bloomer may have to wait until he's a year old or more.y age 3, your child should have a full set of 20 baby teeth, and they shouldn't start to fall out until his permanent teeth are ready to start coming in â around age 6.
When should you expect your little one's teeth to start coming in and where? Teething usually starts around 6 months of age, but it can begin at any time between the ages of 3 and 12 months. While each baby's timetable differs, there is a typical teething order for each specific type of baby tooth. Use this handy baby teething chart to learn when it all starts. Baby Teeth Types.