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.
By Michelle Roberts Health reporter, BBC News Babies like bright colours rather than browns Growing research shows that babies as young as four months show a preference for certain colours. Dr Anna Franklin, from the Surrey Baby Lab, has studied more than 250 babies to look at which colours they prefer.