Good Start Gentle with Iron 23.2 oz. powder. Gerber Good Start Gentle Formula features: Comfort Proteins Advantage, easy to digest, may reduce the risk of atopic dermatitis (see product description for more information). DHA & ARA for brain and eye development, prebiotics to support digestive health, for Babies 0-12 months, milk-based powder infant formula with Iron, add water. 3,292 calories per container.