It used to be a custom in Europe to sew children into their clothes at the beginning of winter, only for the clothes to be removed in Spring.
There was a thread a while back that I'm trying to find (I'm on my phone right now, I'll find it later). Basically that practice is a myth. Children grow up way too fast to wear something so tight that it's unremovable. Medieval illustrations only shows children with very loose-fitting tunics or sack dresses, they are so loose that there's no point sewing them in. Only wealthy girls wore tight-fitting clothes, but presumably they are wealthy enough to afford fasteners and have multiple dresses.