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.
Caucasian babies are often born with steel gray or dark blue eyes; they may stay gray or blue or turn green, hazel, or brown by the time they're 9 months old. That's because a child's irises (the colored part of the eye) may gain more pigment in the months after she's born, but they won't get lighter or more blue.