Welcome to JA. I'm Dr. Jeanne Smith. I'll do my best to help you with home support care and advice for the best course of action. Do you see him pull his own feathers out or spend excessive time preening the area that is missing feathers?
Are the eggs in a nestbox? Does he poke his head in and out of the nestbox a lot, could he be breaking the feathers off on the entrance to the nestbox?
The most common reason I see lovebirds lose feathers in that area is if they are itchy because of an internal infection with fungus, yeast, bacteria or parasites but those birds act itchy and pull the feathers out themselves. Since you don't see any of that, I think it may be that he's rubbing them off or breaking them off coming and going out of the nestbox. When they're done with the chick rearing you can see if they start to grow back. Meanwhile, keep an eye out for itchy picky behavior.
Eggs are laid full sized. They don't change at all until a chick hatches out.
Sorry, that question never showed up in the thread. The incubation period is 22 days from the time the birds start sitting on them.
If they didn't start incubating them right away (which is common) they may still be hatching soon. It isn't unusual, though, for the first clutch a pair lays to be infertile.
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