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.
However, they notice contrasts, such as black against white, more than they notice colors that are close, such as blue next to green. the color of a baby's eyes however usually settle into their permanent color by the age of 1. however, it is possible up to the age of 2 for them to change like they did with me.