Week old chicks dying off?

Where did you get them? With chicks that little it's either something congenital, like a defect, or maybe coccidosis. Are you giving them medicated feed? Are they on litter or wire? Coccidosis is more prevalent on bedding as opposed to wire. As a precaution, you could try mixing in some vitamins into their water in case they have a nutritional deficiency. That shouldn't be the case with a balanced chick starter ration, but you never know. I wouldn't give them honey. I have no idea whether this is true of chicks as well as humans, but human babies are not supposed to get honey until over a year in age because of the possibility of botulism spores in the honey. Has your feed been stored properly? If some damp got into the feed, there could be spoilage of some kind that is wreaking havoc on their new systems.
 

At this age if you see one chick come down with something and then other's start acting the same your number one suspect should be coccidiosis.  Medicated feed helps but does not prevent, you can still get an outbreak.  If I were you I would start  them immediately on Corid, like today.  Coccidiosis moves fast and it's lethal.  Usually by the time you see symptoms the chick is too sick to save. 

Corid is available as a liquid or as a powder.  I use the powder because that's what's available near me.  It's labeled as Corid, 20% water soluble and labled for calves.  The dose for the powder is 1/2 teaspoon per gallon of water for 5 to 7 days. It work's very, very well. Make it up fresh every day.  I do not know the dose for the liquid.  If they aren't feeling well you may have to dose each one with an eyedropper several times the first day.

I would at least treat them for that, if it's something else at least you've ruled out something that could kill the whole batch in a hurry.  Also, you won't always see blood in their poop so don't rule it out based only on that.

I don't know if you saw my post about my little black silkie but she was not doing well at all. She has been on corid for 3 days now and she is doing much better. I am not going to say that she won't die, but she is on the right track. You should try corid for sure.

I had the same thing happen today to an Australorp baby.  5 Days old was doing fine.  It was the smallest but was almost hopping around the brooder last night then late morning today I found it just laying in the brooder.  Tried mixing starter with water and giving the  liquid.  fed it some syrup for sweet.  It didn't want to open it's beak.  It stood up a couple times and peeped a couple but after about 2 hours it just gave up.  I thought it might be heat but the other 9 seem to be fine. I got the rest some save a chick electrolyte solution and fed them some egg yolks scrambled.  Hope this helps. Now I am wondering about corid even though they are on medicated food and were eggs from my own hens? Sorry about your chickie just letting you know Your not alone. 

the same thing is happening to me
 

What temperature are they being kept at? They could be overheating in this weather we all seem to be having. Too hot or cold either is bad for them.

the question I have is what bedding do you have them on?

anything they can ingest and stop them up by any chance? like sawdust or kitty litter?

the only time I've seen it ( and I hatch every week ) is when a batch I hatched for a friend of mine ran out of starter grower and bought some from a different place. we are still not sure if it was the feed or the fact that he changed the bedding out to saw dust just a couple days before the tragedy.

he no longer uses sawdust.

another question I have is. they did not by any chance have the " pasty bottom " which would also seal them up and cause a gastric backwash to end their bright and happy future.

LOTS of times this happens when chicks change locations and feeding rations.

add the electrolites to the water. or mix regular green gatoraide with water. ( I use a quart in a gallon waterer topped off with water. ).

the electrolytes " PLUS " I get is 3 dollars for 4 ounces and it makes 128 gallons.  but nothing wrong with the gatoraide I use it too.

mine were all on paper towels.  the one we lost this morning had poo stuck to his bottom but only just saw it this morning and it was pretty obvious. We cleaned it off after a bit and the chick peeped about it but then was gone an hour later. 

I now have the rest of them on  durvet electrolyte and some corid just in case.