If you have bantams and large fowl chicks together, that could be your problem. I separate mine out to brood. The bantams will huddle under the bigger chicks and sometimes end up suffocating there. If they are all piling together in one area, your heat might be a little less than it needs to be, you want them moving around and not be huddled together or trying to get away from the lamp (means it it too hot).Alright experienced chickeners. Went out to check on the chicks before bed and found another dead chick under the sweeter heater. Laying flat out, chicks laying all over the top of it. How many dead chicks is normal per batch? Let's say I ordered 50 chicks (20 meat birds). What mortality rate should I expect? All three that have died have been some of the smallest in the batch. Is it normal for them to be eating, drinking, running and then just suddenly die?