My family tree from a mere two generations ago is filled with kids who died under the age of 5 - some are mundane but most are undiagnosed. They just know the s

My family tree from a mere two generations ago is filled with kids who died under the age of 5 - some are mundane but most are undiagnosed. They just know the symptoms that were fatal not the cause. 1960s and earlier. That’s not at all that long ago.