If the young child is given a stone and throws it away and a nut and keeps it, he is considered legally capable of acquiring things for himself. The girl who can make that distinction is capable of being married off by a guardian, which would make her eligible for
me’un (marriage refusal declaration). This is considered to be from the age of six or above (Rambam,
Ishut 4:7). Prior to that time,
kiddushin arranged by a guardian is not considered to have taken place and she need not even perform
me’un to be released from the marriage. Above the age of ten she is considered to have reached an age of discernment and to repudiate a marriage by a guardian requires
me’un. Between the ages of six and ten, her ability to understand the concept of marriage determines whether
me’un would be necessary. Similarly, if a minor between the ages of six and ten who has no guardian understands buying and selling values, his/her sales and purchases of movable objects and the gifts (large and small, on the deathbed or otherwise) are valid (BT Gittin 59a; Rambam, Mekhira 29:8–10; Sefer ha-Bagrut 5: lines 70–87). A girl of this age who understands that divorce means separation from her husband, is capable of receiving the
get [
document declaring a divorce] from him from a marriage arranged by her father (Rambam,
Gerushin 2:18).