You say that his eyes are about to open? I had a litter not too long ago.. the female died inexplicably.. leaving about 6 babies who were in the eye-opening stage. I got lab blocks and soaked them in water until they were really soft, and they started eating it. It was not the ideal solution but it was all I could do on a Sunday night in this podunk town.. and it worked. They got enough nourishment from the moist lab blocks, and I gave them a water bottle that was really low-hung down to the substrate, and they lived. But mine were pooping on their own, as was evidenced by the poop in the cage.