Experts have identified a critical period of 33 months (9 months of pregnancy + the first 24 months of the child) during which a specific part of the brain is open for stimulation, after which it closes forever.
During this period, infants crave inputs as they have a biological need to learn.
Also, 80% of the brain development is over before the child is 3 years old.
Sharon Begley, after interviewing several neurobiologists, wrote, Pregnancy Care, Prenatal Stimulation, Prenatal Classes, Child Brain Development. With the right input at the right time, almost anything is possible. But if you miss the critical period, you’re playing with a handicap.