Ok - this is not constipation - this is a baby who is not getting enough milk. this is NOT because you don’t HAVE enough milk, but because she isn’t taking enough milk. I wonder if she is jaundiced (or if she was in the early days?) the clue to this is taking 1-2 hours to feed. A baby who is taking this long isn’t feeding effectively. Good news. This is a temporary problem which is probably easily enough sorted out. But she is not constipated, so please don’t use medications. Your breasts need a bit off extra stimulation in the short term. I would recomment hiring a hospital grade breastpump from your local ABA group. Until you get back on track I would suggest this little routine. Breastfeed her on the first side for 10 mins. Take her off (she will make a desperate grab for it as you go to take her off- but don’t mind that) Wake her up, burp her and offer her the other side. Once again, no more than 10 mins. Express both sides - no more than 10 mins each side with a hospital grade breastpump. Next feed - 3 hours late, breastfeed, then top her up with the expressed milk. You will have time to express because you will be feeding her for a shorter time. In a week or so she will be flying solo and you won’t have to continue. It would be a good idea to see an LC as well. You have every chance of fully breastfeeding.