Then He made the path easy for him.
Al-`Awfi reported from Ibn `Abbas,
"Then He made his coming out of his mother's belly easy for him."
This was also said by Ikrimah, Ad-Dahhak, Abu Salih, Qatadah, As-Suddi, and it was the explanation preferred by Ibn Jarir.
Mujahid said, "This is similar to Allah's statement,
إِنَّا هَدَيْنَـهُ السَّبِيلَ إِمَّا شَاكِراً وَإِمَّا كَفُوراً
Verily, We guided him on the path, he is either grateful or ungrateful. (76;3)
meaning, We explained it to him, clarified it, and made it easy for him to act upon."
Al-Hasan and Ibn Zayd both said the same.
This is the most correct view and Allah knows best.
Concerning Allah's statement,
ثُمَّ أَمَاتَهُ فَأَقْبَرَهُ