At the start of my kids' season (January), there were only a handful of kids in the entire league that wore masks at all. My 6 year old wore one for a few weeks and then would just take it off since she's allowed to not wear a mask outside at school. My 9 year old wore his for most of the season and was probably the last child in the league to take his off. For us, we knew the risk were minimal, but wanted to do our absolute best until my wife's grandfather was vaxxed.