I have a flock of Southdowns and find people often feed them too much during pregnancy. They keep their condition much better than many breeds and the combination of big lambs and too much body fat is bad for any breed. If they've originally come from a flock run on commercial lines, with relentless culling for anything less than all-round good performance, they probably have less problems than many breeds, as they have much narrower shoulders and a longer neck than, say, the Texel or Beltex. Mine began lambing six days early this year - first day should have been tomorrow and have so far had triplets, two sets of twins and a single - all lambed themselves and had vigorous lambs up and suckling within 15 minutes. Look out for a hollow in front of the pelvis - more noticeable in Down breeds than most others. Standing under a hayrack or in a quiet corner looking thoughtful. Holding out the tail or squatting but not dunging or peeing. Lifting upper lip. Pawing the ground and turning around.