Yesterday, as in what time? Chicks don't technically "need" to eat for about 48 hours after hatching because the yolk they absorbed holds them over. But if they're over 24 hours old, they should atleast be showing interest. Are the crumbles to big? My nonmedicated MannaPro chick starter crumbles was way to big and i had to mash them into smaller pieces. They were about half the size of pellets at first. They went to town then. I noticed if i dropped a few pieces in front of them from above, they showed more interest too. The quick movements really kicked up their instincts.. are you dipping their beaks in the water? If they lift their heads and swallow water, that's usually all it takes. Having to remind them is rare. If they keep refusing to drink or eat atleast by tomorrow, idk to be honest. I haven't experienced this, so I'm no help then.