From countallkids.org:

This one-pager is a great refresher for some and general overview for others on counting young children in the 2020 Census. This resource covers why it is important to count young children, why children are left off of census forms, and two specific tools that you can use to help ensure that all children are counted in 2020. This one-pager also lists five short, tested messages that can be incorporated in your resources from The Partnership for America’s Children messaging research.