Not much actually! My first born, Devon is the baby on the left, July 2001. My second born, Blake on the right, July 2010. They look like the same baby!!! Blake is a little chubbier, but he weighed 2 pounds more at birth. Blake also has a fuzzy hair. But all in all...same kid! The smile, the nose, even their pretty blue eyes...the same. I love my boys!