Some of my hens are pecking the chicks....what do I do?

[JacinLarkwell]

Yeah mine look like that,
I put mine in the coop at 2.5 months old , when they eat and walking around one off the hens keeps pecking them . So I've isolated that hen ..

Should I have isolate the chicks instead??.

They have been in the pen for a 4 days now and uts still happening , 3 out the 4 adults have stopped laying and I have 6 chicks but not sure if any are male

Did you just throw them into the pen? Or did you set up a 'see but no touch'pen for a few weeks prior?