On the contrary, you should keep breastfeeding and breastfeed longer. How did the doctor make this diagnosis, though? Because the baby is colicky? Because of blood in the bowel movements? Because the baby spits up a lot? Cow's-milk allergies are often misdiagnosed. Furthermore, much can be done to alleviate such symptoms without you going off milk products, which would be a better solution than weaning. For more information, see the colic information sheet at NBCI.ca.