Level 1: The impact of pregnant women’s diet on their babies’ intelligence. The diet of pregnant women has a crucial impact on their babies’ intellectual development. Pregnant women should ensure balanced nutrition and adequate intake of nutrients such as protein, vitamins, minerals and essential fatty acids. These nutrients are necessary for the baby\’s brain development, and deficiency will affect the baby\’s intellectual development. Level 2: Eat more foods rich in DHA. DHA is an important essential fatty acid.