So of course some more information would help, because the droppings depend on some random things like where you live, the temperature, how old are the chicks, where the chickens are kept, what they eat, their breed, thier gender (egglaying) etcetera, and of course if they have some illness that would cause them to stop eating. The sneezing could be dust, which is potentially dangerous if they have exposure to particles without proper ventilation.
In the morning you should expect maybe some cecal poops and for young chicks possibly watery diarrea, but thats because over the night their crop empties and the solid food passes, and what comes out is more concentrated bacterias from their digestive systems that smell bad, but are healthy. Young chicks also take time to build up the cecal concentration, and you can help them with feeding vitamins B and K, and pro- and pre- biotics foods. My young chicks that show diarreah is mostly due to because their digestive system simply hasn't built the proper bacterias yet, so I usually just give them more time and if I see them eating I know all is well.
I would say some diarreah is normal dependent upon those variables, but you always want to keep an eye out for diarreah that gets worse, and of they stop eating, and act lethargic. So if you want to provide more information or pictures of the diarreah you are concerned with, it may help. Also to help diagnose any respiratory illness, you need to mention your chicks age.
I help my chicks diarreah my mixing banana with their regular feed, which is a vitamin and corn mix i make. The banana is an indigestible carb that delivers the vitamins and nutrients deeper to their digestive system and it build up healthy looking poops in days. I treat them with the prebiotic mix also to combat sicknesses if I have to give other medicines.
Hope this helps, but I think more info is needed if you feel it's getting worse.
