Hi, I have read some of the other threads about babies thrashing their limbs about, but my baby just lifts and slams his legs down so hard in his sleep. I swaddle him tight but he still does it. I am so worried he is going to damage or injure his back or legs, the force of the slamming is scary! Its not wind, not a dirty nappy... I have no idea what it is. Has anyone else experienced this? It keeps me up all night and he is constantly waking himself up. I have also posted in the sleep section.