May one buy items for a child before he is born?
It is permitted to purchase items for the future child prior to birth. Nevertheless, some have the custom to abstain from doing so due to Ayin Hara. One who did not receive this tradition, is not required to follow this custom, and may choose to buy items and ignore the Ayin Hara. However, those who received this tradition, are to try to abide by it. Some are accustomed to have another person buy the item for them. Others are accustomed to pick out the item, and only pay for it after the birth.
 There is no source for prohibiting this, and it is not considered an all encompassing practice of world Jewry that has the power of a set custom to obligate all Jewry to follow.
 Sheilas Rav 2:57 in reply of Rav Chaim Kanievsky
 Rav Eliyahu Landau wrote to me that that one may purchase without any worry, and that on this it states, “One who is not Makpid -Lo Kapdinan”, and that so is the custom that he witnessed.
 This follows the famous ruling of the Rashba [See Rashba 1:9; Heishiv Moshe 13; Aryeh Dbei Ilai Y.D. 19] that the Minhag of women is holy and is to be abided. [Heard from Rav Leibel Groner who is of the opinion that one should guard this custom]
 Heard from Rav Leibel Groner