Do any of you know when the involuntary jerky movement of a newborn's arms and legs stops? My 6 week old DD still has very jerky, involuntary movements and is constantly smacking herself in the face which startles her so she cries. She likes to be swaddled at all times because of this, however, because of these movements she unswaddles herself all the time, smacks herself cries and I rush to swaddle her again. This goes on all day and night. Anyway, I'm just wondering if anyone knows when babies develop more control over thier limbs?