Some infant formulas may include prebiotics. You can ask your healthcare professional for advice about whether your baby requires a formula containing prebiotics.At around 6 months, and not before 4, you can start introducing solid foods that contain prebiotics. Some age-appropriate foods that contain prebiotics are: Vegetables: sweetcorn, asparagus, snow peas, green peas, leek, onion Fruits: bananas, watermelon, apples, nectarines, white peaches, dates Grain sources: oats, bran muffins, rye crackers, wheat bread Legumes: chickpeas, lentils, baked beans