@james@cycling@rower The polish law is a bit blurry on that. Childen under 10 on bicycles are considered pedestrians and have to be supervised by an adult (cannot use bike lane either). I think the code doesn’t say anything on the supervising adult being also on the bike. Never been stopped, though.
As a sole adult, there are special terms on which you can find yourself on the pavement legally (weather/speed limit/pavement width combo), but I’d still probably chose not to do that.