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.
18 months is the generally accepted age for teaching colors. Some kids learn their colors sooner and some learn them later. 18 months â 2 Â½ is a great age for specifically teaching colors. You should always be reviewing colors with your child though, all the way up to kindergarten.