We have a fifteen month old ewe taking care of her first lamb, a single. The lamb is now about 8 weeks old. Both halves of the ewe's udder were balanced and equal until about 1 week ago. Now, one side is much smaller than the other. We were afraid it might be an infection, so we examined her. The smaller udder half is the same temperature as the full half. No sign of soreness, or hardening. Everything seems ok. Is it possible that the lamb is simply only drinking from one side, so the other side has just shut down production? Both the lamb and the mother seem to be in perfect health. Should we be worried?