There was some discussion on here a while ago about children heading footballs.
I am concerned but others not so much. That of course was about concussion but there are other issues that can originate from 'heading' a football.
I am not clever enough to copy my Twitter message as it appears there so here is the link.
Football causes orbital trap door fracture with restricted eye movement An 8-year-old girl at A&E with headache, nausea, and double viision after being hit on her right eye by a football during a physical education lesson at school. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(19)33223-4/fulltext?dgcid=raven_jbs_etoc_email