Mothers milk should not be stopped. You can add lactase to milk.

NO,do NOT stop breastfeeds! Lactose intolerance is usually temporary,along with loose motions. Ensure a gap of atleast 2-1/2 hours inbetween breastfeeds,maintain strict hygiene in feeds and add Enterogermina vial half vial twice a day for 5 days. Remember,the number of motions is NOT important for first 3-4 months of life,and may vary from 10-12 a day to just one motion after 3-4 days. What IS important is the consistency,which should be soft and formed. If she has accompanying rashes on buttocks,apply rashfree cream twice a day and avoid diaper use.