A baby with diarrhea should not breastfeed.
Not true !
The best treatment for a gut infection (gastroenteritis) is breastfeeding. Furthermore, it is very unusual for the baby to require fluids other than breastmilk. If lactose intolerance is a problem, the baby can receive lactase drops, available without prescription, just before or after the feeding, but this is rarely necessary in breastfeeding babies. Get information on its use from the clinic. In any case, lactose intolerance due to gastroenteritis will disappear with time. Lactose free formula is not better than breastfeeding. Breastfeeding is better than any formula.