Chicks not hatching

[beggas82]

Hi, can someone help? I just had a batch of 50 eggs and only 10 hatched, about 20 seemed to be fully grown in the egg but never lasted the last few days to hatch, can someone help me with what I'm doing wrong. Humidity was around 60 then around 70 for the last few days

 

[sumi]

Welcome to BYC

Your humidity was a bit high for incubating chicken eggs. Opinions on the correct levels vary greatly, but I personally incubate at no more than 45-50% for the first 18 days, upping it to around 65% afterwards. It could be something else went wrong in your hatch though. There is a breakdown of hatch failures in this article that may help shed some light:

https://www.backyardchickens.com/a/egg-failure-to-hatch-diagnosing-incubation-problems