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.
They are just baby teeth, why fix them? Most babies get their first tooth around 6 or 7 months of age; usually the bottom front two incisors. Some kids are a little slower erupting the first tooth causing parental worry. It can be even around 12 months for the first one to poke through. Additional baby teeth will continue to come in till almost three years of age. There really is a lot of variability on the sequence.