Look up an old newspaper from say 100-120 years ago and check out the obituaries.
Or just walk through an old graveyard. There’s a pioneer cemetery near my old place with so many children’s graves. One family gravesite has the mother’s name, the father’s name, a couple of their kids, some young, some adults… and one is just titled ‘babies’.
Like, so many babies died for that mother and father they just put them all in one grave, not even names to remember them by…
SEWARD, Mark – Died at Gooseberry Cove, Trinity Bay, on the 2nd inst. [January 1891], Mark, youngest child of Thomas and Rosanna Seward, aged 4 years.
SEWARD, Peter – Died on the 10th inst., Peter, second youngest son of Robert and Mary A. Seward, aged 2 years.
SEWARD – Died on the 14th inst., infant child of James and Mary A. Seward.
SEWARD, Richard – Died on the 15th inst., Richard, youngest son of Joseph and Louisa Seward, aged 4 years.
SEWARD, James – Died on the 19th inst., James, second youngest child of James and Mary A. Seward, aged 2 years (Evening Telegram, January 29, 1891)