I update the graphs below, typically weekly, from time series data on Covid hospitalizations provided by CDC (formerly by HHS). You can view the graphs by state or by region. Pediatric admissions by age group is a fairly new addition to the data file, so it has less historical data than the graphs for all children ages 0-17 combined.
Pediatric Covid Hospitalization Data By State
Pediatric Covid Hospitalization Data by Region
New Admissions for Confirmed Covid by Pediatric Age Group
This data by pediatric age group is a fairly new addition to the HHS data file, so it has less historical data than the graphs for all children ages 0-17 combined.