Maarif-ul-Quran
19:32 - 19:33

وَبَرًّ‌ا بِوَالِدَتِي

"and (He has made me) good to my mother." - 19:32.

Here only the mother is mentioned and not both the parents. Hence it is implied that his birth was a miracle, being without a father. Such a

discourse coming from an infant was a miracle by itself to prove his miraculous birth.