I may have a cold weather event coming. Will purchase some hay to put in pens. Will keep chicks off cold surfaces and provide additional windbreak. Since hay dark it should aid collection of solar heat in morning when needed most. Swapping it out periodically will also keep world drier for chicks. Keeping chicks hydrated may be a little more difficult. I have no electricity in barn. Soaking of oats will begin tomorrow. Problem is smaller chicks will not be able to dilute nutrient intake much to meet water intake means via that route. If chicks have a hydration issue, then they will cheap a lot more than usual. The youngest brood is approaching point where chicks can consume whole corn although diluting with energy is also problematic with such small chickens. Where hens still involved, if mother can be kept in exceptional energy status, then she will invest more in the brooding side. Momma has to crank up her metabolism a lot doing that and hens are generally at their lowest weight about 2 weeks post-hatch. Latest hatching hen is in that window.