This photo is nice. The composition is cool with the body lines leading thru the picture... The shallow DOF and light are good, and the smiley was a nice idea. Unfortunately, I really think you should consider asking for unsubmit the photo and remove it from the internet... For normal people this is just a cute photo of a baby but for the pedophiles this could be an issue. (i would send this as a PM, but you are still anonymous, so this is the only way for do it now). Just my 2 cents for preserving you and the baby from sick people around the world.
Sweet, and the shallow DOF works well as does the crop, though some may complain about the head being chopped, I think it's perfect - you've given enough to give context but maintained focus on that sweet bottom. I think would be better if clothing/ nappies had been removed far enough in advance that the skin didn't still show imprint marks?