"Figure 2: Infant and neonatal mortality rates for low birthweight babies: by age of mother, 2015","" "England and Wales ","" "","" "Notes","1. Linked infant deaths (occurred in 2015). 2. Babies weighing less than 2,500 grams. 3. Infant - deaths under 1 year. 4. Neonatal - deaths under 28 days. " "Unit","Rate per 1,000 live births" "","" "Age of mother at birth","Infant","Neonatal" "Under 20","42.1","34.3" "20 to 24","34.0","25.9" "25 to 29","30.2","24.5" "30 to 34","29.8","23.5" "35 to 39","32.0","25.3" "40 and over","32.2","24.8"