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.
Best Answer: A baby starts to walk when she/he is around 10 to 12 months old. Baby starts to talk in her/his 12 to 15 months. How wonderful to observe baby growing up. It's a tough job but very rewarding !!