The child shakes for 3-4 seconds while falling asleep on the breast. H…

The child shakes for 3-4 seconds while falling asleep on the breast. Head and arms. It happened five times every 3-4 days. When you take the breast out, it stops. Nothing worries her, she doesn't cry, she doesn't whimper, just shaking then stops. The first time I noticed it, I was scared and lifted my daughter, after which she woke up and looked at me with an incomprehensible sleepy gaze. To the baby is six months old. It started at 5 months old for the first time. We registered with a doctor but is there anyone who has had this?