Football Manager 2021 Xbox Edition

Sign 5 Wonderkids, click on the player name and on overview click on Information, then under media description it will tell you if this player is a wonderkid, as you play through the game, the media description of players who start as wonderkids will change, I presume this only works when the player is described as a wonderkid.

Here are some I found in my save, I would thing it's the same for everyone, but check first to make sure the media description is a wonderkid, also save before you sign someone as I had one player described as a wonderkid but when I signed him his description had changed so I had to sign someone else.

Eric Garcia Man City
Ferran Torres Man City
Pedro Porro Man City
Reece James Chelsea
Callum Hudson-Odoi Chelsea
Ansu Fatti Barcelona
Pedri Barcelona
Rodrygo Real Madrid
Vinicius Junior Real Madrid
Erling Haaland Dortmund
Eduardo Camavinga Rennes