Not sure this belongs in Bugs, but it's been a long time for some of them (wiki says 3 ingame days for chicks to mature but for many of my chicks it's been more than three real life days).
Coop is fully watered and contains over 100 units of food, and I left space for the 1x1 chicks to turn into 2x2 adult chickens in such a way that worked last world; do I need a hen in the coop now? Has the maturation time changed? What the fuck?