This morning about 9:00 we discovered our call duck eggs had hatched. Mum had left the nest with 3 babies and when I checked there was one more in there. He was still slightly damp so he may have hatched after mum had gone. He was quite cool so I picked him up and put him on a towel with a heat pack under him. About 3 times since I've dribbled a glucose-water solution over his beak which he seems to be taking a bit of. It's now 8pm and he is still just lying there, only peeping or moving when touched. I'm very worried.