JubileeFarmer
Songster
Three of your pullets are reddening up, especially the one on the far left of the photo, so they might start laying sooner than you expect. You have at least one that's not reddening up yet so she may wait a while to start laying. I would recommend offering them oyster shell now. They will only eat what they need. If they don't need it yet they will ignore it until they do. Wait until the fourth one reddens up before giving them layer feed. She doesn't need the extra calcium right now.