Maggots in hatching eggs, how to avoid this

[NikolasW]

I have a broody hen that I decided to let hatch a bunch of eggs, they just recently hatched and one of them was about half way out of the shell and had maggots all over, in its eyes and other areas. I read a post

 

[NikolasW]

I have a broody hen that I decided to let hatch a bunch of eggs, they just recently hatched and one of them was about half way out of the shell and had maggots all over, in its eyes and other areas. HAS ANYONE ELSE HAD THIS