to one who is in the cradle as a child?" The cradle (al-mahd) is the lap, according to the interpretation of Qatadah.
كَيفَ نُكَلِّم ﴿من كَانَ﴾ أَي: من هُوَ ﴿من المهد صَبيا﴾ وَالْمَهْدُ: الْحِجْرُ؛ فِي تَفْسِيرِ قَتَادَةَ.