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.
Permanent eye color is not set until a baby is at least nine months old, so wait until your child's first birthday to determine what color they will be. Even then, sometimes you may find little surprises. Subtle color changes can still occur all the way up until about three years of age.