Can children earn a plenary indulgence?

I think I might have found a loop hole in the whole plenary indulgence one can earn during the Year of Mercy.
Most of the conditions are pretty easy to obtain/do except for the “no attachment to sin”
Can children who are not of the age of reason earn a plenary indulgence? If so, they are to be free from sin as they have not reached the age of reason. But…they are not able to go to confession or receive the eucharist because of age, so maybe they can get a pass on that?

Hi,

One must have reached the age of reason in order to obtain a plenary indulgence for someone else. Children below the age of reason don’t need any plenary indulgences for themselves.

Fr. Vincent Serpa, O.P.

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