When did you start your baby on cereal? When is the best time to start Gracelynn on cereal?? Please I am looking for advice. I know 3 1/2 months is deff to young I am asked you guys a simple question .Thats what 2 doctors told me to do was put cereal in her bottle. I didnt see any harm seemings they were doctors and seemings that have liscense i listened to them, I am a new mom i didnt know what to do. Was i not supposed to do what the doctors told me to do and let my daughter continue to throw up? be hungry cause she was spitting up all the time? But the cereal was STOPPED!!! at 1.5 months old, and hasnt had it since them, i read the things it can do and it wasnt helping her thats why i stopped it. So please ladies i came to ask adivce about this, and because my daughter has issues with her stomach like i do already. She gets gas bubbles all the time .