Netherlands defender Khalid Boulahrouz left Dutch Euro 2008 training on Wednesday after his wife was transported to a hospital with pregnancy complications, the Dutch FA (KNVB) said on Thursday.
In a statement, the KNVB said the prematurely born daughter later died.
A spokesman declined to say whether Boulahrouz would be returning to the squad for Saturday's quarter-final in Basel against Russia.
Boulahrouz has started all three of Netherlands' group victories so far in the tournament.