"Figure 5: Lowest unexplained infant mortality rate for normal birthweight babies in 2017","" "Unexplained infant mortality rate by birthweight, England and Wales, 2004, 2016 and provisional data for 2017","" "","" "Notes","1. Figures are based on death occurrences. 2. Data for 2017 are provisional. 3. Low birthweight babies are those born weighing less than 2,500 grams. 4. Normal birthweight babies are those weighing 2,500 grams and over. " "Unit","Deaths per 1,000 live births " "","" "","Low birthweight (under 2,500 grams)","Normal birthweight (2,500 grams and over)" "2004","1.87","0.38" "2016","1.26","0.24" "2017","1.04","0.20"