Answered by: Maulana Mustafa Umar
Someone is asking if not having children is a sin?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allah, the Most Gracious, the Most Merciful
Islam encourages having children. A man came to the Prophet (PBUH) and said: I have found a woman of rank and beauty, but she does not give birth to children. Should I marry her? He said: No. He came again to him, but he prohibited him. He came to him the third time, and he (the Prophet) said: Marry women who are loving and fertile, for I shall be proud of your large numbers over other communities.
It is allowed to delay having children for a while or spacing out children, if there is some good reason for that, such as if the wife is ill or weak. However, it should not be done out of fear of poverty. Allah says, “Do not kill your children for fear of poverty. We shall provide for them as well as for you…” [17:31]
Only Allah knows best
Written by Maulana Mustafa Umar
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 Abu Dawud #2050