UEFA says it is not safe for players' children to join in postmatch celebrations on the pitch at Euro 2016.
The scenes of toddlers in full Wales kit joining their fathers on the pitch after their 3-1 win over Belgium has added to the surprise semifinalists' feel-good story.
However, UEFA has asked for no more on-field family scenes when Wales play Portugal in Lyon on Wednesday.
"It is a European Championship, not a family party," UEFA tournament director Martin Kallen said. "A stadium is not the most safe place for small kids.
"It is nice pictures. We are not 100 percent against it but we are cautious."