Why isn t she fed directly on the breast? If you have nipple issues, I am sure the lactation specialist nurse can assist you. Why soy milk and not normal milk? And why bottle feeds at night? What prevents you from exclusively breastfeeding her? This question has many such issues where interaction with you is needed. I cannot be sure that there is underfeeding or overfeeding since you did not provide me with her birth weight. Do consider asking the detailed question directly. In the meantime, may I suggest that you stop giving her soy milk unless there are reasons that you haven t disclosed. Switch over to a normal milk formula that has anti-colic ingredients (Novalac AC is an example). Take her to a pediatrician to confirm that there is no narrowing of her anus or anal canal that is causing this problem, or a redness around the anus that is causing pain and preventing her from evacuating properly. Other than that, I cannot advise you of any more measures that you can take without examining her. Wishing her a speedy resolution of the problems. Dr. Taher