The World: Population - Age 0-4 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 29. | Thailand | 4,143,032 | 2018 | |
| 178. | The Bahamas | 24,844 | 2018 | |
| 128. | The Gambia | 272,252 | 2018 | |
| 75. | Togo | 1,226,074 | 2018 | |
| 187. | Tonga | 11,471 | 2018 | |
| 162. | Trinidad and Tobago | 77,398 | 2018 | |
| 87. | Tunisia | 889,327 | 2018 | |
| 19. | Turkey | 6,647,968 | 2018 | |
| 106. | Turkmenistan | 487,621 | 2018 | |
| 204. | Turks and Caicos Islands | 4,047 | 2018 | |
| 219. | Tuvalu | 1,219 | 2018 | |
| 199. | U.S. Virgin Islands | 5,973 | 2018 | |
| 14. | Uganda | 8,845,166 | 2018 | |
| 61. | Ukraine | 2,000,511 | 2018 | |
| 105. | United Arab Emirates | 488,208 | 2018 | |
| 32. | United Kingdom | 3,891,791 | 2018 | |
| 4. | United States of America | 22,162,008 | 2018 | |
| 139. | Uruguay | 216,563 | 2018 | |
| 54. | Uzbekistan | 2,418,168 | 2018 | |
| 179. | Vanuatu | 22,157 | 2018 | |
| 49. | Venezuela | 2,756,051 | 2018 | |
| 16. | Vietnam | 7,358,407 | 2018 | |
| 222. | Wallis and Futuna | 1,061 | 2018 | |
| 119. | West Bank | 317,230 | 2018 | |
| 160. | Western Sahara | 82,404 | 2018 | |
| 34. | Yemen | 3,743,276 | 2018 | |
| 44. | Zambia | 3,054,443 | 2018 | |
| 57. | Zimbabwe | 2,214,482 | 2018 |
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