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.
Babies' eyes change color about six to nine months after birth. This is usually when melanin production starts inside the eyeball. A one year old with darkly pigmented eyes might have been born with blue eyes. Eye color change in babies is usually from a lighter to darker shade. Don't expect your baby's brown eyes to change back to a blue â it most likely will not happen naturally. Eye colors ordered from high to low melanin concentration.