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In page My Lai massacre:

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Owing to the chaotic circumstances of the war and the U.S. Army's decision not to undertake a definitive body count of noncombatants in Vietnam, the number of civilians killed at Mỹ Lai cannot be stated with certainty. Estimates vary from source to source, with 347 and 504 being the most commonly cited figures. The memorial at the site of the massacre lists 504 names, with ages ranging from one to 82. A later investigation by the U.S. Army arrived at a lower figure of 347 deaths,[citation needed] the official U.S. estimate. The official estimate by the local government remains 504.[7]