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, on the other hand, are usually born with blue, grey-blue or green eyes and are more likely to go trough dramatic eye color changes which become more apparent at the age of about 6 months when you may notice that your babyâs eyes are changing into darker blue, grey, green, hazel or even brown.