Surah Maryam 19:29

فَأَشَارَتْ إِلَيْهِ ۖ قَالُوا۟ كَيْفَ نُكَلِّمُ مَن كَانَ فِى ٱلْمَهْدِ صَبِيًّا

So she pointed to him. They said, "How can we speak to one who is in the cradle a child?"

Translation: Saheeh International

Tafsir

Thereat she pointed them to him intimating to them that they ‘talk to him’. They said ‘How can we talk to one who is who happens to be in the cradle still a little child?’

Excerpt from Tafsir al-Jalalayn, commentary on 19:29, via Quran.com. The reader has the full commentary and 9 more tafsirs.