Grandson I think I mentioned has type A. The doctors can do a swab and find out the same day if you have a good doctor.
Depends where you live pretty much which one is floating around.
I mentioned all types of flu are circulating but A and B are more common but maybe google what types are common where your at. This gives many states but not all.
Both can kill kids but they say type B appears to be more deaths from type B. Now they put Tamiflu in the mix
The Flu Taking a Toll, Pediatric Deaths Hit 17-Year High
https://www.healthline.com/health-news/flu-season-2020-what-to-know
Flu symptoms and complications,
Has list of symptoms of both children and adults to see a doctor right away young people with kids should google.
https://www.cdc.gov/flu/symptoms/symptoms.htm