A good rule of thumb is to introduce a new food each week. This also means mixed foods, like stews, soups and pastas with sauce should be avoided until each main ingredients are tolerable to baby. For example, once baby has had plain egg noodles, tomatoes and beef separately, a light spaghetti could be introduced. Most importantly, remember that babies need complete nutrition from breastmilk or formula first. The AAP states that solids are complementary to the breastfed diet until after the first year.
Babies love to experiment with new foods.
Keep the introduction process fun and interesting, while taking it slow, and your child will be on his way to a healthy diet of solid foods. Whole grain cereals are healthier for baby, and most don't take too long to prepare. Bring the liquid close to a boil while stirring. This process is similar to making instant rice. Flavor the oatmeal with a little expressed breastmilk or formula, if desired.