red & itchy watery eye..

Hello all.. My 5 months old baby boy got red & itchy watery eye since last 2-3 days. I think it's very itchy & irritates him a lot that's why he keeps rubbing his hands over his eye. I have been putting My breastmilk in his eyes but can't see much difference. Please advice me if anyone knows any eye drop or home remedies for red & itchy eyes in 5 months old baby. Thank u!