Generally a common child remains within the womb of his mother for ten lunar months, but here (in CC Adi 13.80) we see that the Lord (Caitanya Mahaprabhu) remained within the body of His mother for thirteen months

Expressions researched:
"Generally a common child remains within the womb of his mother for ten lunar months, but here we see that the Lord remained within the body of His mother for thirteen months"

Sri Caitanya-caritamrta

CC Adi-lila

Generally a common child remains within the womb of his mother for ten lunar months, but here we see that the Lord remained within the body of His mother for thirteen months.

CC Adi 13.80, Translation and Purport

In the month of January in the year 1406 of the Śaka Era (A.D. 1485), Lord Kṛṣṇa entered the bodies of both Jagannātha Miśra and Śacī.

Lord Caitanya Mahāprabhu took His birth in the year 1407 Śaka Era (A.D. 1486), in the month of Phālguna. But here we see that He entered the bodies of His parents in the year 1406, in the month of Māgha. Therefore, the Lord entered the bodies of His parents thirteen full months before His birth. Generally a common child remains within the womb of his mother for ten lunar months, but here we see that the Lord remained within the body of His mother for thirteen months.