I can see where the OP is coming from, but I say: Let him keep it.
But take your seven-year old to watch your local lower-league team, buy him (or her) a scarf and a meat-pie, and make him a fan for life.
Our neighbour took Thump to watch a certain green/white hooped team, and gave him a scarf too. Thump had a great time but several Stirling Albion games later is an Albion fan through and through.
( The same neighbour also took a life-long Juventus fan to watch them at Celtic Park last year – travelled through on the team bus, sat with season-ticket holders in his Juventus kit and had the time of his life! )