I don't think terramycin is good to use in their eyes, but a tiny amount of amoxi shouldn't hurt. My vet told me that terramycin has tetracycline in it, and any animal under six months shouldn't have it. It can permanently discolor their teeth. I use erythromycin for the tiny ones. It is used in hospitals for newborn human babies. I don't think using the terramycin for a short time though will do any harm. I've had to use it in a pinch! If you think about it....by the time they're six months old, they'll get adult teeth in. My wee ones are battling ookey-eyes too. *grimace*