Hellobee Boards

Miracle Blanket, but it's pricey. I had good luck with the Halo ones though. The trick is to pin his arms at his sides. Make sure they are straight. Any bend in them and he will wiggle his way out. And you do the swaddle fairly tight. I haven't heard of any concerns about arms (I guess besides making sure you haven't got then pinned behind his back).

The swaddle has to be tiiiiiiiiight. I had the best luck with A+A, but only after I got over my fear of it being too tight! (My little lady was small, too. . . too small for the Miracle Bkanket to work well!)

The woombie is great for that age! No way for them to get out of it... zip it up and they're all snug in there.

Here's a great blog post from Mrs. Pen:
http://www.hellobee.com/2012/12/26/the-double-swaddle/

That might work for your houdini too.

These were the only ones that worked great with R. She broke out of the A&A blankets, even double swaddled.

http://www.amazon.com/Summer-Infant-SwaddleMe-Adjustable-3-Pack/dp/B003JHYDIQ

Also we just put her arms down so they were laying right next to her body.

Miracle blanket too. LO broke out of everything else. She eventually broke out of the miracle blanket too (legs first then arms) but it was the only thing that worked more than a few nights.

The only one that I had was a velcro one, I would put one arm down, fold the flap over, put the other arm on top of that flapand then fold the other flap over. Then I'd make sure the velcro strip was kind of on his back, he never broke out and we used that swaddle for every nap and overnight from about 2 weeks to 5.5 months.

Woombie was the only one that could contain LMW! It looks funny but is SO much easier than any wrapping swaddle. Stuff and zip.