My 4 week old son, after BFing and latching well for the most part of his little life, for the last 2 days or so, will pull off and cry while feeding, and won't latch after the breast is emptied a little. I've tried burping and that doesn't seem to be the issue. I have to burp him 2 times at least at each breast, and after he burps the first time he roots and fusses and acts hungry still, but will only suckle at the breast, and won't actually latch. Once the breast is a little soft, he won't latch. I tried pumping and putting it in a bottle, but he suckles a bit and makes a face and pulls away. Someone was saying my milk could have gone sour. (Both DH and I have been very stressed these last few days...). Not sure what i can do...or what the issue is. I had this problem with my first son as well, and ended up pumping for 2 weeks until I dried up (my pump is kinda cheap). I DON'T want that to happen this time. Any advice would help lots...before I pull all my hair out.