Whether children can bind themselves by vow to enter religion?

Objections

Objection 1 : It would seem that children cannot bind themselves by vow to enter religion. Since a vow requires deliberation of the mind, it is fitting that those alone should vow who have the use of reason. But this is lacking in children just as in imbeciles and madmen. Therefore just as imbeciles and madmen cannot bind themselves to anything by vow, so neither, seemingly, can children bind themselves by vow to enter religion.
Objection 2 : Further, that which can be validly done by one cannot be annulled by another. Now a vow to enter religion made by a boy or girl before the age of puberty can be revoked by the parents or guardian (20, qu. ii, cap. Puella). Therefore it seems that a boy or girl cannot validly make a vow before the age of fourteen.
Objection 3 : Further, according to the rule of Blessed Benedict [*Ch. 58] and a statute of Innocent IV, a year's probation is granted to those who enter religion, so that probation may precede the obligation of the vow. Therefore it seems unlawful, before the year of probation, for children to be bound by vow to enter religion.