I'm a new mother and my little boy just turned 5 weeks. Within the last week or so halfway thru the feeding, on both sides, he begins thrashing his head back and forth and throwing his arms and legs around. I thought at first it was because he needed to burp or had gas but it doesn't stop. It almost looks like has playing with my shield but becomes frustrated and starts crying and then screams. I tried to calm him down and then retry but nothing seems to help when this starts. I've also tried switching breasts. He eats really well. We have no problem with latching and when the behavior stops (sometimes just as suddenly as it began) he latches back on and finishes. Any help or advice would be appreciated!