Question:

A woman has become very weak. She is unable to take care of children properly. She becomes very weak due to pregnancy. After conceiving, it becomes difficult to eat and drink for three to four months. Her blood count decreases. Would it be permissible for this woman to have an operation by which pregnancy is prevented due to the above reasons?

Answer: حامدا ومصليا ومسلما

Taking care of the children is not the responsibility of the mother. If she is unable to look after them, due to her weakness, then the father should hire a wet-nurse. As for weakness after pregnancy, then all women go through this phase. Yes, if her weakness is so severe that it will lead to death, then instead of a (permanent) operation, she should use temporary contraceptive.

And Allah knows best.
(Hazrat Mufti) Ahmed Khanpuri (May Allah protect him)
The answer is correct.
(Mufti) Abbas Dawud Bismillah (May Allah protect him)
Mahmoodul Fatawa Vol.4 Pg.718
Also see here.