You can look at TGA's own data to assess whether kids need covid vaccines - Communicable Diseases Intelligence 2021 - COVID-19 Australia: Epidemiology Report 51 (health.gov.au)
Under the age of 11, there were 4 ICU cases, or 0.0482% chance of ICU.
There were 0 deaths
Chance of hospital admission was about 5%, which is fairly high but it is not known what level of severity implies a hospital stay
