Jeremy Doku played 86 minutes in Belgium’s Group G opener, a 1-1 draw with Egypt, but missed the subsequent 0-0 draw with Iran.
His absence was initially attributed to illness, with his wife Shireen expected to give birth in mid-July.
In fact, Doku travelled to the UK for the arrival of his son, Praise.
Belgium later confirmed that, with the federation’s approval and accompanied by a team doctor, Doku flew to London to be with his wife. He is due to rejoin the squad in Seattle on Tuesday evening as preparations continue for the next match against New Zealand.
Speaking to Reuters, the 24-year-old said no one wants to miss the birth of their first child, while acknowledging the competing demands of professional football and noting the federation’s understanding.
England forward Ollie Watkins, a father of two, voiced his support for Doku, saying criticism of the decision was misplaced. He stressed how significant and unrepeatable the moment is, adding that players already spend long periods away from family during the season.
The Professional Footballers’ Association said players should not have to sacrifice fundamental family moments, and should be supported in balancing professional commitments with major life events. Treating players as people as well as athletes, it added, is vital to a healthy working environment.
The Fatherhood Institute also backed Doku. Deputy chief executive Jeremy Davies said society can treat players like gladiators who exist for entertainment, but some things matter more than money.