I bough 6 chicks the first time, one most likely got a raging case of coccidosis but we nursed her back to health....got rid of the one rooster, a pullet had a prolapse with her first egg and didn't make it so 4 left the first year....one died at 2 + years old from peritonitis..... I got 4 chicks the next year....got rid of the rooster (I tend to get one every time it seems). He died recently at his new home from a predator attack but my other 3 are still going..... I brought home a total of 13 chicks this year 1 was already too far gone from pasty butt and died the first night, one got her head stuck in a feeder mishap and died from a broken neck (bantam polish are fragile which is what both of these were). I still have the other 11 chicks (including 2 of the bantam polish). This years batch is approx 7 weeks old and doing great. If you watch for pasty butt, keep your temperatures within chick limits, don't let them get overcrowded so they can't pile and smother each other, have safe waterers so they can't drown (or put enough rocks in so that they are shallow enough to keep them from drowning) have Corid on hand so that if they are looking like they have runny stinky poo you can treat the probable coccidosis outbreak then you have avoided the overwhelming amount of things that cause chick death. There is many times just a case of 'failure to thrive' or getting sick chicks, or shipping stress, etc. that causes multiple deaths but if you get healthy chicks and monitor them for temp (not too high, not too cold), clean water, clean food, adequate space etc you should expect to have over 90% or better live.