Hatching eggs please help!! - Page 5
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If you have eggs already incubating and then you add more eggs 3 days later, those late ones will hatch 3 days later that the first ones. That's called a staggered hatch since you will have eggs due on 2 different days.
It is easier for beginners to put all the eggs in and start incubation all at once. Then when you up your humidity for lockdown on the early eggs, you don't hurt the later ones.