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.
Many parents worry about when their children will sprout their first baby tooth, also knows as primary teeth. The average time to expect a first tooth is between 4 and 7 months of age. However, every child is different and timing and appearance will vary among each one. The two, front bottom teeth usually appear first. Most parents do not look forward to teething babies expecting they may be fussy or uncomfortable.