I think this idea is brilliant. This is surely a way of pushing down the rate of infant mortality. A poster advertising this idea could be like this: A young, happy woman with full breasts from which her own child has already had its fill, but that she is still holding on her arm. She lifts another, frail child and puts it on her breast. I would like to do something like this – simply because I find the whole idea so gratifying and delightful – but I cannot give you a firm promise, or only by February at the earliest.«
Käthe Kollwitz, Letters of Friendship, 16 December 1921