Quick Answer. An experimental variable is something that a scientist changes during the course of an experiment. It is distinguished from a controlled variable, which could theoretically change, but the scientists keep constant. Continue Reading.
While you were pregnant, your baby developed tooth buds, the foundation for baby teeth (also called milk teeth). Very rarely, a baby is born with a tooth or two, or grows a tooth in the first few weeks of life. But the vast majority of babies sprout their first tooth sometime between 4 and 7 months old.
A answered. By around age 12, your child should have all of his permanent teeth. Expect your child's baby teeth to start to fall out in early elementary school, around age 6. Baby teeth usually fall out in the same order they came in. The two bottom front teeth tend to go first, followed by the two top front teeth.