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.
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