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.
4 8 months most infants start teething between 4 8 months of age there is a very wide range of what is normal i have seen several infants born with bottom front teeth already and many who didn t get their first tooth till 9 14 months oldin almost all cases it just works it own way out as the child growsery variable while most infants start between 4 8 months old it is perfectly normal to start younger or later while rare some children do not start teething until 12 months of age children who get their baby teeth late will often get their permanent teeth later as well