Baby shaking while eating

My baby is 5 months old and I've caught her shaking uncontrollably while feeding her. She is exclusively breast fed and she's done it a handful of times since she's been born. I don't know if anyone else has had this issue. It never really concerned me because within the last 5 months it's only happened maybe 3 times, but it's happened everyday for the last 3 days. It only happens while she is eating. It doesn't seem to bother her and it lasts for 10-15 seconds and she continues on eating. It happened twice the other day, but normally it's just one time out of all the feedings. I took a video for the doctor, but don't know how to post a video of it on here