White chest doesn't always mean female. Young males also have white chests.When we had baby peas, my husband and I had no idea what sex they where, My daughter pointed out the obvious a white chest means a female. Ours are blue not tan, so not sure in your circumstance.....
Unfortunately our chicken supplier at the time was cheated by a breeder, some of our recent purchases where not vaccinated, they got sick and died, I think that's what happened to my beautiful baby peas, unfortunately they didn't live longer than 5 months. I cried and cried.