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 do babies start teething. Most babies begin teething around 6â8 months of age, and those teeth will usually emerge in a predictable order. However, babies are all unique, and some can get their first tooth as early as 3 monthsâor as late as 1 year. Do yourself a favor and donât sweat it.