I don't think lettuce would hurt them, in small amounts. I'd introduce new foods and scraps a little at a time when they're so young. I really don't know if it would affect them adversely or not if you didn't. Mine don't get to go outside when they're that little. We live on a farm and have barn cats that hunt for a living and wouldn't think twice about taking a chick. Now that I have a run it probably would be OK, but before that there was no way it would happen.Ok, I am gonna be a stupid newb
and ask when I can feed my chicks kitchen scraps, like lettuce. They went outside today to! They are 6 days old.