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.
4. Make Sense of the Sounds from 7-12 Months. Around 7-12 months your baby will start trying to make sense of the sounds they make and trying to make the patterns of sound, which may match the ones adults use. Reading and talking with your child can help to foster this skill.