babies' brain growth has the same speed of light. External stimulation more frequent, more intense, nerve cell development faster, while the baby is born, he is helpless and cannot change the surrounding environment.
Very young babies cannot concentrate and require a lot of encouragement and stimulation. So, constantly changing the objects baby can see is particularly important. We can hang colored chain within baby's vision and stimulate the development of baby eyesight. 24 colored chains of 6 colors can help baby build concept of classification by color.