Good! 4 successful chicks and 3 that didn't hatch, we broke them open and none of them was the yolk back in their belly. So would this mean they died a few days before hatching. But the other 4 seem to be doing well eating and drinking and sleeping
Sorry this is so late
Lovely to hear your 4 are doing well
Yes it does sound like it could have been after lockdown but before they had chance to absorb the yolk. Here is an article you might like to check out ~ https://www.backyardchickens.com/a/egg-failure-to-hatch-diagnosing-incubation-problems