So we were pretty sure that the boys were fraternal, because we were getting good at telling them apart. But Angela has recently been reading stories about other fraternal twinfants, and all the stories talked about how different the behaviors were of the individual babies - different sleeping habits, different eating requirements, reaching milestones at different times, etc. But our boys are still pretty nuch spot on together. They even have growth spurts at the same time, maintaining 8-10 oz difference between the two. The only difference we have found is that Ben has a lovely bald spot on the back of his head, complete with combover up top, but Ed still has all his hair. We still need to ask the doctor what she thinks.