Having a second wife is the only option for him to have children
2-10-2007 | IslamWeb
Question:
Salamalaykum BYy the grace of Allah Iam married man for more than 7 years i love my wife too much and she too loves me we are very happy Alhumdulliah she is more religious than me and i respect her for that but unfortunately we dont have kids, and Doctors told me she is having some problem and she cant conceve a baby, we tried all options including IVF but failed, I want to have kids the only option left for me to have second marriage, by doing so i may hurt my wife which i dont want to do because i love my wife too much, and at the same time i want to have kids what to do iam confused please advice, I did not discuss this with my wife i have seen her crying to have kids
Answer:
All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
First of all, we ask Allaah to increase your piety, righteousness, love, and affection, and grant you form this woman a pious progeny that will be a comfort to your eyes for both of you.
Marrying a second wife is allowed for any one who is able to fulfill the conditions of being just between the two wives. For more benefit, please refer to Fatwa 81469.
A second marriage is not an insult to the first wife. The jealousy and grief that a wife may experience because of her husband marrying another wife is absolutely normal; this does not affect the love between the spouses. The evidence is that ‘Aa’ishah 
used to be jealous from Khadeejah and yet she used to love the Prophet, sallallaahu ‘alayhi wa sallam, and she was the most beloved wife of the Prophet, sallallaahu ‘alayhi wa sallam.