Ds has pretty great arm control and has started picking things up, but he still has the wavy-gravy arms at night. We swaddle him because of it and has started breaking out of swaddles- even the beloved miracle blanket. He's on the verge of rolling and have a feeling that he's a side/tummy sleeper, so swaddling won't be forever. I really thought the flailing arms would be over by his age.
Re: When does the waving arm thing stop?
Once he's on his side or his tummy - he won't wave his arms around. We're going through the same thing except haven't been able to swaddle DS for a long time now.
We're exhausted.
"When it comes to sleeping, whatever your baby does is normal. If one thing has damaged parents enjoyment of their babies, it's rigid expectations about how and when the baby should sleep." ~ James McKenna, Ph.D., Mother Baby Behavioral Sleep Center, University of Notre Dame