If it's managing to feed leave it where it is
As long as it's not being pushed out by it's siblings or mum (sometimes they just
know) or looks as if it's been trod on or ill - it stands a far better chance with her at this stage, than it does with you
Taking it away means they're not getting all the antibodies and proper nourishment it needs from the sows milk and reintroducing at a later stage might come with it's own problems
You could ask your vet if they can give you 1ml of gleptosil for it (the pack is 250ml and costs about £18, but they might have one open and just draw you off what you need
) we iron jab all of ours at 3 days old and it seems to have a much better effect that the kickstart (for us anyway)
Hope all's well this morning