My two month-old boy has been fussy while breastfeeding for the last four days. He usually takes 30-35 minutes to feed and has been getting fussy after 10-15 minutes. He'll kick his legs, pound my chest with his little fists and cry out. I'll try to burp him at this point, but rarely get a burp. Even when I get him to burp he will continue to fuss when I try to put him back onto the breast. After continuing like this for 5 minutes or so, he will latch on for the remainder of the feed. Occasionally, he will continue to be fussy for the entire feed.
Any ideas what could be causing this? Has this happened to anyone else? I don't think he has reflux.