I'm so sorry you lost your dear little girl Summerfly
Grobags have been on the scene a very long time. My German penfriend gave us one her son, now 38, had outgrown for our wriggly little boy - now 35 - who kept kicking his covers off. My friends were really envious but at the time you couldn't buy them over here so I made a pattern & had quite a production line. Now that wriggly little boy has two sons of his own, both slept in grobags as little ones. Much more sensible than duvets or sheets & blankets.