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.
The average baby begins to show the first signs of teething between 6 and 10 months of age, but when do babies get all their teeth? On average, all of a child's teeth have come in by 30 months of age.However, there is variability in the timing and sequence of tooth eruption based on a number of factors, including gender and ethnicity.abies usually get their teeth in this order and at the following ages: 1  Lower center incisors: 5 to 7 months. 2  Upper center incisors: 6 to 8 months. 3  Upper lateral incisors: 9 to 11 months. 4  Lower central incisors: 10 to 12 months. 5  First molars: 12 to 16 months. 6  Canines: 16 to 20 months. 7  Second molars: 20 to 30 months.