There was no 4x drop in child mortality during that time in, for example, the UK: 1850 to 1900 is about -20%, 1900 to 1920 another ~25% - the big 4x reduction f

There was no 4x drop in child mortality during that time in, for example, the UK: 1850 to 1900 is about -20%, 1900 to 1920 another ~25% - the big 4x reduction from 1850 wasn't reached until about 1945. Protest and even suffrage somewhat proceeded the big reduction in the first half of the 20th century.