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.
Your babyâs eye color becomes firmly established by 6 to 12 months, Sutter Health reports. Once your baby reaches his first birthday, his eyes will most likely remain the same general color for the rest of his life.