Nitrates are natural chemicals that are found in the soil, air, and water. Therefore, they’re found in many vegetables. When consumed in excess, they can negatively affect blood counts, resulting in lethargy and breathing difficulties. But this is rare for babies 6 months old and up. The American Academy of Pediatrics recommends that foods with naturally occurring nitrates be avoided before 3 months of age. This should be easy since babies don't need solid foods until around 6 months of age. Vegetables provide so many beneficial nutrients that the benefits typically outweigh any harmful effects. But this is also another reminder to incorporate more variety into your child's diet. Too much of one food, whether good or bad, is not ideal. If you are very concerned, purchasing organic will help minimize the intake of nitrates.