my cockatiel laid her 1st egg on the 12,2nd on 14,3rd on the

 
My cockatiel laid her 1st egg on the 12,2nd on 14,3rd on the 16, and 3rd on 18 when will they hatch?
PLEASE HELP ME!!
It depends on when she starts setting on them. Give them 30 days from the last one laid and then if nothing, throw them out. You can also see if there is a baby in them by holding one up to a flashlight and looking through it (called candling). When the egg is a few days old you will be able to see veins if it's fertile. It will be clear if it's not. Good luck.

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Parrot breeder