Dying duckling

Last year our ducks only had one baby. This year they’ve had ten which is super exciting, they’re so cute 🥺 One of them isn’t doing that well though. It wouldn’t keep up with the others and would lay in the grass away from the rest. We brought it in and it’s been drinking and peeping but it’s not walking or opening it’s eyes. I know it will most likely die but I want to give it it’s best chance. Is there anything else we can do to help it?