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.
The BabyCenter Editorial Team. Your child's ability to recognize different colors improves around 18 months â the same time he begins to notice similarities and differences in shape, size, and texture. It will be a while longer before he knows basic colors, but most children can name at least one by 36 months.In the meantime, he'll add new colors to his repertoire through practice. Children love looking at picture books of objects organized by shape and color.hen he misses one, don't tell him he's wrong (or pretend he's right). Just say the correct name in an encouraging tone. Kids learn at their own speed, so don't be too concerned if your child doesn't know as many colors as someone else his age.