This is what I don't understand. When I was a baby my mother fed me porridge at 2 months . I turned out perfectly fine. Some parents are starting their babies on cereal at 1 week old. The way a person chooses to parent is their business. Most of you trust in the Doctors so much and take medication that brings out different effects. How is feeding a baby cereal harmful? A child has never ran a fever from having cereal in their bottle. However those vacines are the ones that are that safe.