"Figure 5: Babies of mothers aged under 20 years have a higher risk of unexplained infant mortality","" "All unexplained infant deaths by mother's age, England and Wales, 2004 to 2020p ","" "","" "Notes","" "Unit","Death per 1000 live births (rate)" "","" "","Under 20","20-24","25-29","30-34","35-39","40 and over" "2004","1.33","0.83","0.40","0.28","0.34","0.24" "2005","1.32","0.85","0.46","0.28","0.28","0.22" "2006","1.30","0.72","0.37","0.20","0.20","0.42" "2007","1.16","0.65","0.39","0.18","0.22","0.24" "2008","1.07","0.68","0.34","0.23","0.26","0.23" "2009","1.23","0.59","0.37","0.26","0.21","0.22" "2010","1.08","0.62","0.33","0.21","0.16","0.18" "2011","0.82","0.53","0.32","0.22","0.23","0.34" "2012","0.92","0.57","0.28","0.21","0.16","0.27" "2013","1.30","0.56","0.29","0.26","0.22","0.34" "2014","1.23","0.57","0.32","0.17","0.16","0.14" "2015","0.79","0.39","0.33","0.20","0.17","0.14" "2016","0.98","0.58","0.32","0.23","0.17","0.34" "2017","1.18","0.52","0.28","0.15","0.18","0.17" "2018","1.21","0.56","0.36","0.18","0.22","0.28" "2019","1.24","0.47","0.30","0.20","0.20","0.17" "2020p","1.07","0.51","0.22","0.15","0.18","0.17"