An experimental group is the group in an experiment that receives the variable being tested. One variable is tested at a time. The experimental group is compared to a control group, which does not receive the test variable. In this way, experimental groups are used to find answers in an experiment.
1 At around 9 months of age, babies begin to pull themselves up to a standing position. 2  By 10 months of age, a baby should be able to grasp objects with thumb and forefinger.
Eventually your kids will grow into their own special set of teeth that have a unique shape, color and size. If your child has extremely stained or yellow teeth, you should consult your dentist about his or her options. We recommend 18 years of age is the earliest kids should have professional teeth whitening. There are several reasons for this but the main reason has to do with the fact that the pulpal of the teeth are enlarged and can be damaged prior to this age.