I have been suspecting my baby has a milk protein intolerance or sensitivity to milk since she was born. She had green mucusy poops and I cut way down on dairy and the green went away but still has mucus. I know I need to cut milk out completely. For a few days now she has been really congested. I took her to the doctor and said she doesn't have a cold. She has a cough but I think it is because of the congestion. I've tried saline and a bulb syringe and I can't get anything out. I believe this may be related. Can a baby be tested for a milk allergy?