Glad I found this thread! We just had a hen hatch 3 babies, & have another who's 1st chick is hatching right now. We have had some eggs cracked early & had no idea what we could do. We will be trying the wax or Elmer's glue next time!

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A half an inchI used a old birthday candle and melted it over a 1/2" crack and 2 weeks later out popped a healthy Rhode Island Red chick. Worth a shot and best of luck......
A half an inchthat about this wide (---------------)