Thanks everyone!! Yes, as amy said, the boys are identical.
THey do have different "looks", but sometimes Ry has a "look" like Tristan and Tristan has a "look" like Ry (hope that makes sense). Tristan is about 8oz larger too, which helps tell them apart SOMETIMES because his face is fatter, but if Ry has his head a certain way, his head looks just as fat. So it's tricky <img src="i/expressions/face-icon-small-smile.gif" border="0">