"Figure 4: Infant Mortality Rate by Grouped Birthweight and Gestation, 2011 Birth Cohort, England and Wales","" "","" "","" "Notes","1. Pre-term is 24 to 36 completed weeks; term is 37 to 41 completed weeks; post-term is 42 weeks and over. 2. Births occurring at less than 24 weeks gestation account for 0.1% of all live births. 94% of these babies born in 2011 died before their first birthday. This represents 17% of all infant deaths. 3. Known gestational age only. 4. Infant mortality rates per 1,000 live births." "Unit","Infant mortality rate per 1,000 live births" "","" "","Under 2,500g","2,500g and over" "Pre-term","62.1","2.8" "Term","37.5","92.8" "Post-term","0.4","4.4"