A child in a Car with L Plate

The answer to that is in the theoretical test book. Start with that.

In the "code de la route" it's covered under Section II "Permis de conduire provisoire", Articles 6 and 9

See here (pages 16 and 20) : https://www.code-de-la-route.be/download/Permis%20de%20conduire.pdf

Titre III, Chapitre II, Article 6, 2° Le véhicule : b) ne peut transporter de personnes autres que celles visées à l'article 9.

Titre III, Chapitre II, Article 9. Le titulaire d'un permis de conduire provisoire peut, outre le guide, être accompagné d'une seule autre personne.

Or in other words, in addition to the designated qualified driver who must be in the front right passenger seat, you can have one additional passenger.

If your provisional license has expired, you cannot drive.

NK if this isnt a joke message you really should not be driving until you completely undertsand the law full stop without asking complete strangers ona forum

If a provisional license has expired (either 18M or 36M) you are no longer allowed to have a new provisional before 3 years after the expiration date.

You can, however, follow lessons in a driving school and take the test with the driving school and you will need to have done 6 hours of driving school to pass the test anyway.

You can have your guide in the car and a person who has a license since more than 8 years. A child does not met that qualification.