chicks eating grass

[CUchickens]

So, I have my new chicks out in the run. They are about 4-5 wks old. When they are in the run, they are eating grass and whatever they can find. I am worried about them not getting enough grit, so do I need to supply some to them?? Thanks for your help!

 

[mmajw]

I usually start offering grit around 8 weeks