The World: Population - Age 0-4 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 57. | Zimbabwe | 2,214,482 | 2018 | |
| 44. | Zambia | 3,054,443 | 2018 | |
| 34. | Yemen | 3,743,276 | 2018 | |
| 160. | Western Sahara | 82,404 | 2018 | |
| 119. | West Bank | 317,230 | 2018 | |
| 222. | Wallis and Futuna | 1,061 | 2018 | |
| 16. | Vietnam | 7,358,407 | 2018 | |
| 49. | Venezuela | 2,756,051 | 2018 | |
| 179. | Vanuatu | 22,157 | 2018 | |
| 54. | Uzbekistan | 2,418,168 | 2018 | |
| 139. | Uruguay | 216,563 | 2018 | |
| 4. | United States of America | 22,162,008 | 2018 | |
| 32. | United Kingdom | 3,891,791 | 2018 | |
| 105. | United Arab Emirates | 488,208 | 2018 | |
| 61. | Ukraine | 2,000,511 | 2018 | |
| 14. | Uganda | 8,845,166 | 2018 | |
| 199. | U.S. Virgin Islands | 5,973 | 2018 | |
| 219. | Tuvalu | 1,219 | 2018 | |
| 204. | Turks and Caicos Islands | 4,047 | 2018 | |
| 106. | Turkmenistan | 487,621 | 2018 | |
| 19. | Turkey | 6,647,968 | 2018 | |
| 87. | Tunisia | 889,327 | 2018 | |
| 162. | Trinidad and Tobago | 77,398 | 2018 | |
| 187. | Tonga | 11,471 | 2018 | |
| 75. | Togo | 1,226,074 | 2018 | |
| 128. | The Gambia | 272,252 | 2018 | |
| 178. | The Bahamas | 24,844 | 2018 | |
| 29. | Thailand | 4,143,032 | 2018 | |
| 20. | Tanzania | 6,199,334 | 2018 | |
| 84. | Tajikistan | 954,436 | 2018 | |
| 81. | Taiwan | 988,707 | 2018 | |
| 53. | Syria | 2,466,324 | 2018 | |
| 114. | Switzerland | 366,043 | 2018 | |
| 107. | Sweden | 485,427 | 2018 | |
| 147. | Swaziland | 167,515 | 2018 | |
| 169. | Suriname | 46,023 | 2018 | |
| 15. | Sudan | 7,977,869 | 2018 | |
| 71. | Sri Lanka | 1,715,299 | 2018 | |
| 55. | Spain | 2,345,665 | 2018 | |
| 60. | South Korea | 2,004,800 | 2018 | |
| 26. | South Africa | 4,311,640 | 2018 | |
| 64. | Somalia | 1,858,016 | 2018 | |
| 163. | Solomon Islands | 77,291 | 2018 | |
| 161. | Slovenia | 82,362 | 2018 | |
| 130. | Slovakia | 270,981 | 2018 | |
| 213. | Sint Maarten | 2,673 | 2018 | |
| 135. | Singapore | 255,127 | 2018 | |
| 79. | Sierra Leone | 998,200 | 2018 | |
| 198. | Seychelles | 6,259 | 2018 | |
| 118. | Serbia | 321,712 | 2018 | |
| 56. | Senegal | 2,260,458 | 2018 | |
| 52. | Saudi Arabia | 2,576,674 | 2018 | |
| 175. | Sao Tome and Principe | 29,606 | 2018 | |
| 217. | San Marino | 1,532 | 2018 | |
| 184. | Samoa | 19,801 | 2018 | |
| 197. | Saint Vincent and the Grenadines | 6,680 | 2018 | |
| 228. | Saint Pierre and Miquelon | 219 | 2018 | |
| 212. | Saint Martin | 2,688 | 2018 | |
| 189. | Saint Lucia | 10,746 | 2018 | |
| 208. | Saint Kitts and Nevis | 3,512 | 2018 | |
| 225. | Saint Helena | 375 | 2018 | |
| 226. | Saint Barthélemy | 344 | 2018 | |
| 59. | Rwanda | 2,010,359 | 2018 | |
| 18. | Russia | 6,905,174 | 2018 | |
| 82. | Romania | 970,543 | 2018 | |
| 89. | Republic of Congo | 851,071 | 2018 | |
| 153. | Qatar | 110,536 | 2018 | |
| 140. | Puerto Rico | 215,421 | 2018 | |
| 103. | Portugal | 501,490 | 2018 | |
| 66. | Poland | 1,817,657 | 2018 | |
| 10. | Philippines | 12,852,232 | 2018 | |
| 50. | Peru | 2,713,296 | 2018 | |
| 98. | Paraguay | 553,495 | 2018 | |
| 93. | Papua New Guinea | 781,425 | 2018 | |
| 117. | Panama | 331,182 | 2018 | |
| 220. | Palau | 1,171 | 2018 | |
| 5. | Pakistan | 21,138,800 | 2018 | |
| 112. | Oman | 398,392 | 2018 | |
| 133. | Norway | 261,458 | 2018 | |
| 206. | Northern Mariana Islands | 3,931 | 2018 | |
| 68. | North Korea | 1,776,364 | 2018 | |
| 3. | Nigeria | 31,866,180 | 2018 | |
| 30. | Niger | 4,125,153 | 2018 | |
| 101. | Nicaragua | 521,270 | 2018 | |
| 121. | New Zealand | 295,752 | 2018 | |
| 183. | New Caledonia | 20,744 | 2018 | |
| 190. | Netherlands Antilles | 10,021 | 2018 | |
| 86. | Netherlands | 921,844 | 2018 | |
| 41. | Nepal | 3,153,103 | 2018 | |
| 221. | Nauru | 1,091 | 2018 | |
| 142. | Namibia | 206,817 | 2018 | |
| 24. | Myanmar | 4,934,023 | 2018 | |
| 25. | Mozambique | 4,538,469 | 2018 | |
| 47. | Morocco | 2,933,240 | 2018 | |
| 227. | Montserrat | 285 | 2018 | |
| 172. | Montenegro | 32,576 | 2018 | |
| 120. | Mongolia | 312,467 | 2018 | |
| 223. | Monaco | 928 | 2018 | |
| 143. | Moldova | 204,678 | 2018 | |
| 12. | Mexico | 10,461,290 | 2018 |
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