Bulova6,

How do you know they were concussions and not just head bumps or sub-concussive impacts?

Many decades ago, when my son was a toddler, he fell off a sofa and smacked the back his head on a coffee table. It left an indent that is still visible as a 40+ adult. His pediatrician discounted it and told us to expect head bumps. He said the head and brains of children are much more tolerant to head bumps that most understand. The skull is soft and absorbs impacts better. The brain has more fluid to absorb impacts.

Even if these were true concussions, there is no data that suggests prolonged outcomes. Some people are more tolerant of impacts and have little to no proiblems.