Neonatal mortality rate is the number of neonates dying before reaching 28 days of age, per 1,000 live births in a given year.
| 1970 | 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brunei Darussalam | 6.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.9 | 4.9 | 5.0 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.0 | 4.9 | |
| Cambodia | 40.3 | 35.3 | 26.9 | 21.3 | 20.3 | 19.3 | 18.2 | 17.2 | 16.4 | 15.6 | 15.0 | 14.4 | 13.8 | 13.2 | 12.7 | 12.3 | 11.8 | |
| Indonesia | 48.5 | 30.6 | 22.7 | 19.8 | 17.3 | 16.6 | 15.9 | 15.3 | 14.6 | 14.0 | 13.5 | 13.0 | 12.5 | 12.0 | 11.6 | 11.2 | 10.9 | 10.5 |
| Lao People’s Democratic Republic | 47.4 | 38.4 | 33.8 | 28.9 | 28.0 | 27.0 | 26.2 | 25.4 | 24.6 | 23.9 | 23.2 | 22.6 | 22.0 | 21.5 | 21.0 | 20.5 | 20.0 | |
| Malaysia | 16.1 | 7.6 | 4.9 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 |
| Myanmar | 47.7 | 37.6 | 32.6 | 28.4 | 27.7 | 27.0 | 26.3 | 25.6 | 25.0 | 24.3 | 23.7 | 23.2 | 22.6 | 22.1 | 21.6 | 21.1 | 20.6 | |
| Philippines | 25.0 | 18.9 | 16.7 | 15.3 | 13.8 | 13.6 | 13.5 | 13.4 | 13.4 | 13.5 | 13.6 | 13.8 | 14.1 | 14.3 | 14.4 | 14.4 | 14.2 | 14.0 |
| Singapore | 15.1 | 4.1 | 1.6 | 1.3 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.0 | 1.0 | 1.0 | 0.9 | 0.9 | 0.9 |
| Thailand | 46.4 | 20.7 | 12.1 | 9.6 | 7.8 | 7.5 | 7.2 | 7.0 | 6.8 | 6.6 | 6.4 | 6.2 | 6.0 | 5.8 | 5.7 | 5.5 | 5.4 | 5.2 |
| Viet Nam | 23.6 | 15.0 | 12.5 | 11.7 | 11.6 | 11.5 | 11.4 | 11.3 | 11.2 | 11.1 | 11.0 | 10.9 | 10.8 | 10.7 | 10.6 | 10.5 | 10.3 |