Recently hatched out 2 amazing Aylesbury ducklings and all has been well until last night. One of them (the larger of the two which is usually more active) lay under the brooder asleep and didn’t respond when I was next to it making abit af noise. This morning it appears to have gotten worse as it’s legs have slightly splayed out and it is struggling to keep its head up. I have tried putting natural herbs and spices into there food high in Vit E however I feel as if it is deteriorating. They are 4 days old and really don’t want to lose one. The other duckling is healthy. Does anyone have any ideas?