Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 31
Sanskrit:
तस्या अनुदिनं गर्भ: शुक्लपक्ष इवोडुप: ।ववृधे शूरसेनेशतेजसा शनकैर्नृप ॥ ३१ ॥
ITRANS:
tasyā anudinaṁ garbhaḥśukla-pakṣa ivoḍupaḥvavṛdhe śūraseneśa-tejasā śanakair nṛpa
Translation:
After receiving semen from Mahārāja Citraketu, the King of Śūrasena, Queen Kṛtadyuti gradually developed in her pregnancy, O King Parīkṣit, just as the moon develops during the bright fortnight.