Hadith 6.2
Marriage
Asma’ daughter of Yazid said she heard God’s Messenger say, “Do not kill your children secretly, for the milk with which a child is suckled while his mother is pregnant overtakes the horseman and throws him from his horse.”* * It is here said that a child which is suckled while his mother is pregnant will suffer from it in later life, the tradition speaking specifically of his being thrown from his horse and killed. Abu Dawud transmitted it.
وَعَنْ أَسْمَاءَ بِنْتِ يَزِيدَ قَالَتْ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «لَا تَقْتُلُوا أَوْلَادَكُمْ سِرًّا فَإِنَّ الْغَيْلَ يُدْرِكُ الْفَارِسَ فيدعثره عَن فرسه» . رَوَاهُ أَبُو دَاوُد
Hadith gradings, numbering and translations can differ between editions. For legal rulings or detailed interpretation, consult qualified scholarship and the referenced edition.