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.
Generally, teeth start appearing between 4 months and 7 months of age, but every baby is different. When your baby starts teething, you may notice that he or she will start to drool more or may want to chew on things.The first teeth to come in are usually the 2 bottom front teeth.he milk can pool in your babyâs mouth and cause tooth decay. For the same reason, do not give your baby a sippy cup of juice or milk in the crib. Your baby can start using a sippy cup when he or she is about 6 months of age. Stop giving your baby a bottle when he or she is 1 year of age.