The World: Population - Age 0-4 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 30. | Thailand | 4,084,857 | 2021 | |
| 177. | The Bahamas | 24,774 | 2021 | |
| 129. | The Gambia | 269,518 | 2021 | |
| 75. | Togo | 1,284,561 | 2021 | |
| 188. | Tonga | 10,797 | 2021 | |
| 163. | Trinidad and Tobago | 70,061 | 2021 | |
| 89. | Tunisia | 863,636 | 2021 | |
| 18. | Turkey | 6,509,179 | 2021 | |
| 105. | Turkmenistan | 490,298 | 2021 | |
| 205. | Turks and Caicos Islands | 3,993 | 2021 | |
| 219. | Tuvalu | 1,248 | 2021 | |
| 200. | U.S. Virgin Islands | 5,814 | 2021 | |
| 14. | Uganda | 9,713,373 | 2021 | |
| 64. | Ukraine | 1,860,650 | 2021 | |
| 103. | United Arab Emirates | 509,942 | 2021 | |
| 31. | United Kingdom | 3,897,909 | 2021 | |
| 4. | United States of America | 22,506,398 | 2021 | |
| 138. | Uruguay | 216,313 | 2021 | |
| 54. | Uzbekistan | 2,422,225 | 2021 | |
| 179. | Vanuatu | 22,041 | 2021 | |
| 49. | Venezuela | 2,774,634 | 2021 | |
| 16. | Vietnam | 7,152,605 | 2021 | |
| 221. | Wallis and Futuna | 1,033 | 2021 | |
| 118. | West Bank | 320,828 | 2021 | |
| 159. | Western Sahara | 85,616 | 2021 | |
| 36. | Yemen | 3,684,258 | 2021 | |
| 41. | Zambia | 3,218,077 | 2021 | |
| 56. | Zimbabwe | 2,278,138 | 2021 |
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