(Maryam) 19 : 29
فَأَشَارَتْ إِلَيْهِ ۖ قَالُوا كَيْفَ نُكَلِّمُ مَنْ كَانَ فِي الْمَهْدِ صَبِيًّا

Then she pointed into him; they asked: "How can we speak to the baby who is in the cradle?"

See explanation 3: 46 and 5: 110.