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.
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.