Reference: Fataawa Mu’aasirah – Pages 83-84;
Liqaa.aat al-Baab al-Maftooh – No.1361
Question: A man has two wives, and according to our custom, the wife who gives birth to a child is to be given a gift, once her postpartum bleeding ceases. So is he [Islaamically] required to give both his wives a gift [each] when one of them gives birth, or is he only required to give a gift to the one who gave birth?
Response: In principle, he is not required to give anything to the other [wife] who did not give birth. Just as the other wife who did not give birth, when she does so, then he is to give her a gift, without giving a gift to the other one.
And [the principle is one of] maintaining justice and equality between the two in giving.
This means, when he gives the first one who gave birth a hundred [riyals, (for example)], then he is [also required] to give the other a hundred [riyals] when she gives birth.
And he is not required to give [any gift] to her before she gives birth.
However, if he fears some problems [may arise], then I am of the opinion that if he gave both of them [a gift each] everytime one of them gives birth – in order to prevent any problems, then that is better, and is considered from the aspect of [maintaining] harmony.