Adopted 3 orphan lambs Saturday morning and one is not doing so well as the others. One was orphaned at birth and doing brilliantly (he is a week old) and two were taken off mum as she had quads and couldn't feed them all. They were on her for a few days though so got colostrum initially (they are 5/6 days old but quite small). One of them has taken well to bottle and substitute milk whilst the other one struggles to stay latched to the bottle and looses interest half way through feeding. This isn't my main problem with him though as I have increased frequency of feed for him. I am mainly worried about his bowels. He is straining to pooh and groans whilst he tries. He excretes very small amounts of scour - mustard coloured and runny but only a few drops. I have cleaned his bottom so there is definitely no external blockage and rub him as his mother would to encourage him to pooh but nothing seems to be working. Getting worried for him now. Can anyone suggest anything I can try?