I went through the same thing with mine.
What I did was to keep flushing the eggs with purified water daily. This keeps bacterial growth down and gives the babies time to finish developing. If yours are already starting to smell, this means that bacteria is already taking over.
Fill an empty needle-less syringe with purified water or Ringer's Lactate if you can find it. Flush each egg gently with the solution. Once you have rinsed out each egg, gently make a small nick in the membrane and let the fluid begin to drain. The babies won't start to metabolize their yolk until they start breathing air.
Place the clean eggs on wet paper towels in a clean container and place it back in the incubator. Twice a day, use the syringe to gently moisten the eggs and babies, being careful not to fill the eggs too full or too suddenly so you don't accidentally drown a baby. The eggs must stay moist. Change the paper towels and wash the container every two days.
In a few short days, the babies will metabolize their yolks and hatch. I did this exact thing, and have 5 healthy babies now.
Gale
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