The first five years of a child's life are hugely important in terms of development and sets them up for the rest of their lives. Understandably the first five years of life sees enormous growth as a baby grows into an infant.
You can easily monitor a baby's growth in weight and size, but what is more difficult to monitor is the development of their brain. Over this critical period the brain is forming and the neurons are evolving into a network that will power your childs thinking for the rest of their lives. Scientific research has shown that the more a baby is stimulated, the earlier their brain develops and the more attentive and clever they will grow to be in time.
Stimulating a baby from birth will pay dividends in the long run. This is why you should constantly talk with your little ones, even if they are nowehere near being able to communicate back. This is why you should expose them to lots of different environments - take them on days out, take them on long walks (even if you are simply pushing them in a buggy) and show them as many different experiences as you can. All of this will help their brain develop early on and you will be rewarded with bright children in the future.