Not the first time I read or hear this: some Pickelhauben, because of their small size, were actually worn by children.
I was given, when I was about 12, a battered M15 that had shrunk, being displayed on a scarecrow in a garden for a long time. It was presented to me as having been worn during the war by an army child ("enfant de troupe", who did exist in the French army, from the age of 13, till the end of the XIXth century. I don't know about German Imperial armies).
https://www.ebay.com/i/303573775717?campaign-id=90001&run-date=20200527081000&templateId=c9bb7c1b-7d13-47db-a41b-43e64b1b36cc&templateVersion=342&co=15&placement-type=mfe.piyi2P&user-id=43585586252&instance=1590592200&site-id=0&trackingCode=32TE76001_T_AGM_ORM&placement-type-name=mfe.piyi2P&mfe-Id=100690
I was given, when I was about 12, a battered M15 that had shrunk, being displayed on a scarecrow in a garden for a long time. It was presented to me as having been worn during the war by an army child ("enfant de troupe", who did exist in the French army, from the age of 13, till the end of the XIXth century. I don't know about German Imperial armies).
https://www.ebay.com/i/303573775717?campaign-id=90001&run-date=20200527081000&templateId=c9bb7c1b-7d13-47db-a41b-43e64b1b36cc&templateVersion=342&co=15&placement-type=mfe.piyi2P&user-id=43585586252&instance=1590592200&site-id=0&trackingCode=32TE76001_T_AGM_ORM&placement-type-name=mfe.piyi2P&mfe-Id=100690