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.
When Do Kids Learn Colors? Learning colors coincides with your childâs cognitive development and their ability to differentiate colors normally begins to take shape at 18 months. This is also the same time the child will begin to notice the differences and similarities between textures, sizes and shapes.