Resources like books written by people who are experts in their field can help stressed parents who are having a hard time. The following are some of the best books for talking about things like sleep, emotions, potty training, and so on.
The Whole-Brain Child, by Daniel J. Siegel and Tina Payne Bryson
Precious Little Sleep, by Alexis Dubief.
Raising Good Humans, by Hannah Clarke-Fields.
The Danish Way of Parenting, by Jessica Joelle Alexander.
The Complete Guide to Potty Training, by Michelle D. Swaney.
The Co-Parenting Handbook, by Karen Bonnell and Kristin Little.