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.
Depending on the eye color in your family, your babyâs eyes may be their permanent color at six months or a year of age. If their eyes start brown or turn brown during their first year, they will have brown eyes.