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