This might just be a "this year" thing but some input would be appreciated. I have noticed my early eggs had more that stopped developing around 2-3 week point and those that developed to hatch did hatch out. I have also noticed that the recent eggs most are getting up to hatching point but not hatching. The overall number of chicks per hatch is essentially the same. This is what has remained the same. - incubator - humidity 80% (about) - temp - location of incubator - eggs from adult birds This is what has changed. - outside temp - time of year of course both of the above are expected.