The World: Population - Age 0-4 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 214. | British Virgin Islands | 2,178 | 2021 | |
| 9. | Brazil | 17,060,338 | 2021 | |
| 136. | Botswana | 232,705 | 2021 | |
| 144. | Bosnia and Herzegovina | 194,676 | 2021 | |
| 77. | Bolivia | 1,172,393 | 2021 | |
| 165. | Bhutan | 62,548 | 2021 | |
| 204. | Bermuda | 4,018 | 2021 | |
| 66. | Benin | 1,851,053 | 2021 | |
| 170. | Belize | 42,372 | 2021 | |
| 102. | Belgium | 518,824 | 2021 | |
| 111. | Belarus | 410,663 | 2021 | |
| 185. | Barbados | 16,636 | 2021 | |
| 8. | Bangladesh | 17,152,912 | 2021 | |
| 156. | Bahrain | 94,967 | 2021 | |
| 93. | Azerbaijan | 744,141 | 2021 | |
| 115. | Austria | 365,893 | 2021 | |
| 74. | Australia | 1,425,877 | 2021 | |
| 196. | Aruba | 7,150 | 2021 | |
| 146. | Armenia | 170,686 | 2021 | |
| 37. | Argentina | 3,523,765 | 2021 | |
| 195. | Antigua and Barbuda | 7,536 | 2021 | |
| 218. | Anguilla | 1,323 | 2021 | |
| 34. | Angola | 3,745,130 | 2021 | |
| 211. | Andorra | 3,094 | 2021 | |
| 194. | American Samoa | 7,720 | 2021 | |
| 48. | Algeria | 2,841,161 | 2021 | |
| 143. | Albania | 197,010 | 2021 | |
| 21. | Afghanistan | 5,766,850 | 2021 |
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