It was narrated from Muhajir bin Abu Muslim, from Asma' bint Yazid bin Sakan, who was his freed slave woman, that she heard the Messenger of Allah P.B.U.H say: "Do not kill your children secretly. for by the One in Whose Hand is my soul, intercourse with a breastfeeding woman catches up with people when they are riding their horses (in battle) and wrestles them to the ground. (Da'if)