Toppers,
There is no minimum age, in fact the CAA do not consider a child under 2 years to be a 'person' so you can quite legally fly a 2 seater with a baby on board and still be legal and insured (check that last one maybe)
Me and my wife used to fly a cub with our baby daughter strapped to my wife in her papoose. My wife would get strapped in the back seat with the papoose strapped under her belt, then we would slide my daughter in place. Some might say that this is risky, but so is flying anyway if you look at it like that.
Have fun, enjoy, but do look after their ears.
JWF
