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.
She won't be able to see all colors for awhile, but her color vision will improve quickly. The amount of colors she can actually see is not known, but she most likely won't be able to see pastels or lighter colors until around 2 to 3 months of age. Nearsighted. Newborn infants are extremely nearsighted, meaning