A breastfed baby may have an allergy or sensitivity reaction after the mother consumes certain foods or drinks (such as common food allergens like cow's milk, soy foods, wheat, corn, oats, eggs, nuts and peanuts, and fish or shellfish). You don't need to eat any special or different foods while you're breastfeeding. Choose wholegrain varieties of cereal-based starchy foods for added nutrients and fibre. Some dairy produce, such as a yoghurt or a glass of milk. Some protein, such as lean meat, fish, eggs, or pulses.What shouldn't I eat when · Can I lose weight while I'm.