What is the best diet to make sure my baby receives all the nutrients necessary?

Breastfeed, formula. Infants born at term only need either breast milk or formula plus 400 iu vitamin d supplement per day for the first 4-6 months. After that you can begin to introduce foods. Most infants will enjoy a wide variety of flavors and become more picky as toddlers, when feeding becomes more difficult. The only foods to avoid are honey, textures baby will choke on, and foods they show sensitivity to.
A well balanced diet. The most effective way to deliver all the essential nutrients a child needs is via a healthy diet which includes the appropriate amount of foods from all the food groups. More information can be obtained on the web at mypyramid.Gov.