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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Albania | 40.8 | 27.1 | 20.0 | 13.3 | 12.2 | 11.2 | 10.5 | 9.9 | 9.6 | 9.4 | 9.3 | 9.3 | 9.4 | 9.4 | 9.5 | 9.4 | 9.4 | |
| Bosnia and Herzegovina | 18.2 | 9.5 | 7.4 | 6.8 | 6.8 | 6.7 | 6.7 | 6.7 | 6.7 | 6.8 | 6.8 | 6.8 | 6.7 | 6.6 | 6.4 | 6.2 | 6.0 | |
| Bulgaria | 32.5 | 18.3 | 17.5 | 13.3 | 10.8 | 10.4 | 9.9 | 9.3 | 8.7 | 8.2 | 7.7 | 7.3 | 7.0 | 6.7 | 6.5 | 6.3 | 6.2 | 6.1 |
| Croatia | 12.9 | 8.3 | 6.7 | 5.5 | 5.3 | 5.2 | 5.1 | 5.0 | 4.9 | 4.9 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | |
| Czech Republic | 24.3 | 12.1 | 5.5 | 4.4 | 3.4 | 3.3 | 3.2 | 3.1 | 3.1 | 3.2 | 3.2 | 3.2 | 3.1 | 3.0 | 2.9 | 2.8 | 2.7 | 2.6 |
| Hungary | 38.9 | 17.2 | 10.1 | 7.5 | 6.0 | 5.9 | 5.7 | 5.6 | 5.3 | 5.1 | 4.7 | 4.5 | 4.3 | 4.1 | 4.0 | 4.0 | 3.9 | 3.8 |
| North Macedonia | 37.0 | 15.9 | 13.7 | 10.4 | 10.0 | 10.2 | 10.7 | 11.1 | 11.3 | 10.8 | 9.7 | 8.3 | 7.0 | 5.9 | 5.0 | 4.1 | 3.3 | |
| Republic of Moldova | 33.5 | 31.3 | 20.1 | 16.9 | 16.6 | 16.3 | 16.0 | 15.8 | 15.5 | 15.3 | 15.2 | 15.1 | 15.0 | 14.9 | 14.8 | 14.8 | 14.7 | |
| Montenegro | 16.5 | 14.2 | 10.6 | 6.6 | 5.9 | 5.4 | 4.9 | 4.5 | 4.1 | 3.8 | 3.6 | 3.3 | 3.2 | 3.0 | 2.8 | 2.7 | 2.6 | |
| Poland | 35.9 | 17.4 | 9.3 | 7.6 | 6.0 | 5.7 | 5.4 | 5.2 | 5.0 | 4.9 | 4.8 | 4.6 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 |
| Romania | 56.9 | 31.4 | 21.6 | 18.2 | 12.4 | 11.8 | 11.2 | 10.5 | 9.9 | 9.2 | 8.5 | 7.9 | 7.3 | 6.8 | 6.6 | 6.5 | 6.6 | 6.6 |
| Serbia | 28.5 | 12.6 | 9.0 | 7.6 | 7.3 | 7.1 | 6.8 | 6.6 | 6.3 | 6.1 | 5.9 | 5.8 | 5.7 | 5.5 | 5.4 | 5.3 | 5.2 | |
| Slovakia | 29.5 | 14.7 | 9.6 | 8.3 | 6.9 | 6.7 | 6.6 | 6.4 | 6.3 | 6.2 | 6.1 | 6.0 | 6.0 | 5.9 | 5.9 | 6.0 | 6.0 | 6.1 |
| Slovenia | 10.4 | 5.4 | 4.2 | 3.2 | 3.1 | 2.9 | 2.8 | 2.7 | 2.6 | 2.6 | 2.5 | 2.4 | 2.4 | 2.4 | 2.3 | 2.3 | 2.2 |