I BELIEVE THAT YOU LOWER THE TEMP 5 DEGREES A WEEK, SO IF YOU CAN KEEP THE TEMPERATURE AT 80 IN THE COOP WITH A HEAT LAMP IF THEY ARE 3 WEEKS, NO PROBLEM. THE CHICKS NEED TO STAY ON STARTER FOR 6 WEEKS, THEN CHICK GROWER UNTIL THEY START LAYING EGGS, THEN LAYER FEED. BEFORE THEY GET SCRAPS, THEY NEED TO BE ON CHICK GRIT, DIFFERENT FROM GRIT FOR THE FULL GROWN, AS LONG AS TREATS ARE JUST TREATS, THEY NEED THEIR STARTER AND GROWER TO MAKE SURE THAT THEY STAY HEALTHY AND GET THE PROPER NUTRIENTS. OTHERS WILL BE ABLE TO TELL YOU WHAT TO GIVE AND WHAT NOT TO GIVE, I GIVE MY 2 WEEK OLD SOME CORNMEAL JUST FOR A TREAT. HOPE THAT THIS HELPS, PLUS I DON'T KNOW HOW OLD OUR CHICKS ARE AND THAT WILL MAKE A DIFFERENCE.