After they had hatch one had die
How Should I Take Care Of Egg Of Cocktail Bird?
Nest it, if the mother isn't around then wrap it up, BUT DON"T SIT ON IT! Lol but anyways just nest it.
If it is fertile you will need to incubate the egg if the parent isn't doing it. If the egg is infertile replace it with a fake egg to delay the female from laying again real soon since laying eggs is really hard on the body.