"Figure 3: Infant mortality rate by term and age of mother at birth, 2012 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. Known gestational age only. 3. Infant mortality rates per 1,000 live births." "Unit","Rate per 1,000 live births" "","" "","Pre-term","Term","Post-term" "Under 20","32.8","2.3","0.7" "20—24","26.4","1.5","0.6" "25—29","24.1","1.5","0.6" "30—34","21.9","1.1","1" "35—39","21.3","1.2","1.2" "40 and over","21","1.9","2.7"