The most important thing is to include a wide variety of fresh, healthy foods in your breastfeeding diet.
If you think something you're eating is affecting your baby through your breast milk, talk to your GP or health visitor, or call the National Breastfeeding Helpline on 0300 100 0212.
Unless you're allergic to peanuts, there's no evidence to suggest you should avoid them (or any peanut based foods like peanut butter) while breastfeeding. If you're worried about it, or concerned about your baby developing a food allergy, speak to your doctor or health visitor.
Cows' milk allergy (CMA) is one of the most common childhood food allergies. While it's more common when first infant formula milk is introduced or when your baby starts eating solids, it can happen while breastfeeding.
Some babies are lactose intolerant (lactose is the natural sugar in milk). This means they can't digest it – but this not an allergy and may only be temporary. Symptoms include:
If you're worried that your baby is showing signs of an allergic reaction, or intolerance, speak to your doctor. They'll assess your baby and advise you on the best course of action.