We have had issues with poor weight gain and foamy poo with mucus in. I wasn't too worried but things just got gradually worse. Poo had large amounts of mucus and turned green, then there were specks of blood and she actually lost weight. I refused to use formula top ups because I didn't believe lack of milk was the problem. But by 7 weeks she was only just over her birth weight and the midwife suggested wé ask her to be tested for cystic fibrosis. I was starting to get scared. Doctor google said thet her symptoms were consistent with a food allergy so I started an ellimination diet. I decided I didn't want to take the time to experiment with one food at a time so went cold turkey and ate nothing but rice for a week. It took a while but we are finally seeing results! we have yellow poo! And what's better as of today it doesn't have hardly any mucus. I never thought poo could make me so happy! Its early days but she seems to be gaining weight better too. I'm slowly adding foods back into my diet but still leaving out the likely culprits like dairy for now. I'm new to this so would love to hear from other BFing mums who have dealt with food allergies in their LOs.