The women's 400 metres at the 2018 IAAF World U20 Championships was held at Ratina Stadium on 10, 11 and 12 July.[1]
Qualification: First 4 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.[2]
Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.[3]
[4]
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