Hi my baby boy age 18months please suggest which food is best for brain develop and healthy

A. hi for overall health and good mental development a balanced diet having variety of food groups protein like pulses beans egg soya , milk and Milk products, fish ,chicken, meat variety of seasonal fruits and vegetables and green leafy vegetables, especially vitamin A containing yellow orange green fruits and vegetables walnut, almond ,dry fruits, peanuts, flaxseed, lobia, fish continue to breastfeed till 2 years