Is it permissible to marry a second wife for the purpose of procreation without specifying a duration in the contract, naming the newborn after the first wife, and concealing the matter from everyone, including the child, out of consideration for psychological well-being and to avoid harm?

Procreation is one of the purposes of marriage, and there is no harm in marrying solely for this purpose. As for marrying with the intention of divorce after a period, without a condition in the contract, the majority of scholars permit it, while some do not. It is not permissible to attribute a child to anyone other than their mother. Therefore, a legitimate marriage must be contracted without the intention of temporariness, so that the child remains attributed to their true parents.