When you birth a quilt you still have to baste stich so it all lyes flat. if you do that will eliminate the bubbles.You can save the basting stich thred on a pice of card board and use it for quilting if you want.I birthed my first quilt and for a long time did not know any other way! after you get 3/4 way around then you take out the baste stiches and turn it and sew hole up. I sudgest pining hole then lay it down and check it and keep re pining until it is strait then sew.I recentle wonder if it realy is faster, and as for quilting you re bast stick or pin after it is right side out and quilt as you normaly would.