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 to start introducing solid foods. Introducing your baby to solid foods, often called weaning, should start when your baby is around six months old. It's a really important step in your babyâs development and it can be great fun to explore new flavours and textures together.