Thanks for the replies, Mum is feeding well, was a text book birth. She is up to date with fluke and worming. I haven't checked her temperature, will do that in the morning.
They are ryelands and still inside.
Her udder is small but her teats feel normal, there is milk there just not lots of it, however the fact that they never stop feeding I wouldn't expect there to be!
Both lambs are much smaller than others born at the same time, their tummy's don't feel hollow which assures me they are getting something however their lack of bounce and slight hunched appearance plus the fact they are constantly feeding makes me think they are not getting enough.
They don't stretch when getting up.
I have had to top up lambs before and have never had them try to reject the bottle like these two, which makes me wonder?