Wills and Testaments
Malik :: Book 37 : Hadith 37.4.4
Yahya said that he heard Malik say, "The best of what I have heard about the testament of a pregnant woman and about what settlements she is permitted in her property is that the pregnant woman is like the sick person. When the illness is light, and one does not fear for the sick person, he does with his property what he likes. If the illness is such that his life is feared for, he can only dispose of a third of his estate."
He said, "It is the same with a woman who is pregnant. The beginning of pregnancy is good news and joy. It is not illness and no fear because Allah the Blessed, the Exalted, said in His Book, 'We gave her good news of Ishaq and after Ishaq, Yaqub.' (Sura ll ayat 71). And He said, 'She bore a light burden and passed by with it, but when she became heavy, they called upon Allah, their Lord, "If you give us a good-doing son, we will be among the thankful." '(Sura 7 ayat 189).
"When a pregnant woman becomes heavy, she is only permitted to dispose of a third of her estate. The beginning of this restriction is after six months. Allah, the Blessed, the Exalted, said in His Book, 'Mothers suckle their children for two complete years.' And He said, 'his bearing and weaning are thirty months.' (Sura 2 ayat 233).
"When six months have passed for the pregnant woman from the day she conceived, she is only permitted to dispose of a third of her property."
Yahya said that he heard Malik say, "A man who is advancing in the row for battle, can only dispose of a third of his property. He is in the same position as a pregnant woman or an ill person who is feared for, as long as he is in that situation."