Any guesses based on skull/nub?

[paige528]

http://i1352.photobucket.com/albums/q651/paige528/photo-15_zps61777c98.jpg

http://i1352.photobucket.com/albums/q651/paige528/2718B210-E68F-4129-AB0E-4EE1E85CA674-5839-000001937EE733F6_zpsa177b3e7.jpg

[ThreeLittleStars]

maybe boy

[Rainbow baby]

I don't see any clues and I don't get the skull theory so I can't even take a go at having a guess!! Let say Boy fot fun ha!