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.
A baby who is going to have brown eyes may start with blue, and their eye color may start to darken and eventually turn to brown. This normally happens by anywhere between six and 12 months. In fact, most people used to say the eye color was set by the time the baby turned a year old.