I didn't have to use one, but a onesie put on backwards should help a lot. The tail goes through the snap area. It might be a pain with pottying, though. I don't know how quickly you could get it, but I bought a soft collar from YT member Mom to Hotrod. She sells great soft collars.
My little girl was three when she was spayed, and it took her longer to recuperate than my one year old or eight months old. After a few days, she did much better. I hope your baby girl feels better soon.
http://www.yorkietalk.com/forums/yor...ne-collar.html The Kiss-E Collar