I have a mixed-age flock. My three big girls - Easter Egger, RIR, Australorp - are all 11 months old. The babies - one white Leghorn, two Buttercups, two Fayoumis -are all 5 months old. Last night, someone laid a soft-shelled egg from the roost - from its size and placement, I suspect it was my Leghorn, Zoe, because it was biggish, white, and, well, right underneath Zoe.
I know soft-shelled eggs can happen in young chickens with their first attempts, so I'm not worried about that (though none of my big girls, including a Leghorn I had before she died, ever laid soft-shelled eggs). I topped off the oyster-shell feeder and have ordered some more layer feed - I'd had the whole flock on grower. I brought in the one from yesterday to inspect it. But this morning at feeding time I saw another soft-shelled white egg in the coop under the roost where Zoe had been last night, but somebird had already gotten into it and eaten its contents before I got out there. This morning's egg was the same size and color as the one from last night.
Can it happen that a bird will lay more than one egg in a 24-hour period if they're both soft-shelled, or is it more likely that one of my other littles is laying too? I can't tell from behavior - Zoe has started to do the submissive squat, but the Buttercups and Fayoumis all still run away from me.