1. The Importance of Baby\’s Brain Development Baby\’s brain development is the key to his physical health and intellectual development. During pregnancy and the first few years after birth, the brain goes through rapid and critical stages of development. During this period, billions of neuronal connections are formed in the child\’s brain, and these connections will have a profound impact on the child\’s future learning, emotional and social abilities. 2. Factors that affect baby’s brain development In addition to genes, environmental factors can also affect baby’s brain development.