Under-five mortality rate is the probability per 1,000 that a newborn baby will die before reaching age five, if subject to current age-specific mortality rates.
| 1970 | 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Argentina | 71.7 | 28.8 | 19.4 | 16.7 | 14.4 | 13.9 | 13.3 | 12.7 | 12.2 | 11.7 | 11.4 | 11.0 | 10.7 | 10.5 | 10.3 | 10.0 | 9.8 | 9.6 |
| Bolivia | 229.4 | 121.7 | 75.7 | 56.4 | 42.0 | 39.7 | 37.5 | 35.4 | 33.5 | 31.8 | 30.3 | 29.0 | 27.8 | 26.7 | 25.7 | 24.8 | 23.9 | 23.1 |
| Brazil | 132.2 | 63.1 | 34.5 | 24.6 | 18.6 | 17.9 | 17.2 | 16.7 | 16.3 | 16.0 | 16.8 | 15.4 | 15.2 | 15.0 | 14.9 | 14.7 | 14.6 | 14.4 |
| Chile | 80.1 | 19.1 | 10.9 | 9.1 | 8.7 | 8.6 | 8.4 | 8.2 | 8.1 | 7.9 | 7.7 | 7.5 | 7.2 | 7.0 | 6.8 | 6.7 | 6.8 | 7.2 |
| Colombia | 97.2 | 35.7 | 25.1 | 21.5 | 18.3 | 17.7 | 17.2 | 16.6 | 16.1 | 15.6 | 15.1 | 14.6 | 14.1 | 13.7 | 13.2 | 12.8 | 12.4 | 12.0 |
| Ecuador | 137.1 | 53.9 | 29.6 | 23.7 | 19.2 | 18.3 | 17.4 | 16.6 | 15.9 | 15.3 | 14.8 | 14.4 | 14.1 | 13.8 | 13.6 | 13.4 | 13.2 | 13.1 |
| Guyana | 73.9 | 60.8 | 46.5 | 41.4 | 37.3 | 36.5 | 35.8 | 34.9 | 34.0 | 33.1 | 32.1 | 31.1 | 30.2 | 29.3 | 28.4 | 27.5 | 26.6 | 25.7 |
| Paraguay | 77.9 | 45.5 | 33.6 | 29.9 | 25.9 | 25.1 | 24.4 | 23.7 | 23.0 | 22.2 | 21.5 | 20.8 | 20.1 | 19.4 | 18.8 | 18.2 | 17.6 | 17.0 |
| Peru | 197.0 | 80.4 | 37.9 | 26.5 | 20.4 | 19.6 | 18.9 | 18.4 | 17.9 | 17.6 | 17.3 | 17.1 | 16.9 | 16.8 | 16.6 | 16.4 | 16.1 | 15.8 |
| Suriname | 44.9 | 31.1 | 26.4 | 23.2 | 22.6 | 22.1 | 21.6 | 21.1 | 20.5 | 20.0 | 19.5 | 19.0 | 18.4 | 17.8 | 17.3 | 16.8 | 16.2 | |
| Uruguay | 54.0 | 23.7 | 17.0 | 14.4 | 10.8 | 10.4 | 10.0 | 9.7 | 9.3 | 8.9 | 8.5 | 8.1 | 7.7 | 7.4 | 7.1 | 7.0 | 6.8 | 6.7 |
| Venezuela, RB | 63.0 | 29.6 | 21.5 | 18.5 | 17.2 | 17.3 | 17.6 | 17.9 | 18.3 | 19.2 | 24.3 | 24.3 | 24.3 | 24.3 | 24.3 | 24.3 | 24.3 | 24.3 |