Should I Lock Down A Day Early Or A Day Late?

[LapisLazuli]

I have 8 eggs in my incubator and 3 of them a day younger so should I put them on lockdown on day 18 or 19?

 

[LadiesAndJane]

Wait until day 19 if you can. Do you know how your air cells look?

 

[JaeG]

You can wait until the older eggs are internally pipped before raising the humidity. You can candle them to track this, just keep them in the same position as they are in inside the incubator so the babies don't get confused about which way they should be pointing.