Studies disagree with you. Children are absolutely at risk for a wide range of increased impacts from the disease:

Children have increased likelihood of anxiety, communication disorders, and other developmental mental health issues: https://pmc.ncbi.nlm.nih.gov/articles/PMC12290120/

In studies of children and adolescents, it has caused increased likelihood of fatigue, anxiety, and various other symptoms: https://pmc.ncbi.nlm.nih.gov/articles/PMC11339705/

Children are at significant risk of ongoing complications: https://academic.oup.com/cid/article-abstract/80/6/1247/8002...

Cardiovascular risk is demonstrably elevated post infection: https://pmc.ncbi.nlm.nih.gov/articles/PMC11992182/

Increased risk of kidney malfunction: https://pmc.ncbi.nlm.nih.gov/articles/PMC11992607/