I don't know if there is much you can do. You could play "physical therapist" and teach him to walk by standing him up and seeing if he will start to use his legs. I don't know how long he will survive like that and at some point you may need to put him down. But at least you got the others back on their feet. Good luck with this little one. I would try putting him in the cup as well and see if that doesn't help strengthen his legs too.
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