If you have a cold or flu, fever, diarrhoea and vomiting, or mastitis, keep breastfeeding as normal. Your baby won't catch the illness through your breast milk – in fact, it will contain antibodies to reduce her risk of getting the same bug.
Can being sick affect your milk supply?
Getting sick. Just catching a virus or bug such as the flu, a cold, or a stomach virus won't decrease your milk supply. However, related symptoms such as fatigue, diarrhea, vomiting, or decreased appetite definitely can.
Does flu affect breast milk?
No. Flu is not spread to infants through breast milk. The flu is spread mainly from person-to-person via respiratory droplets when people cough, sneeze, or talk, or possibly, when a person touches a surface or object that has the flu virus on it and then touches their own mouth or nose.