The Messenger of Allah ﷺ said, "When a believer in Paradise desires a child, the pregnancy, the delivery, and the child's growth to the desired age all occur in a single moment, just as he wishes."
قال رسول الله ﷺ: المؤمن إذا اشتهى الولد في الجنة كان حمله ووضعه وسنه في ساعة كما يشتهى.
Tirmidhi (2563), Ibn Majah (4338), Ahmad (11063), and Ibn Hibban (7404) all narrated it through the route of Muaz bin Hisham, who said, my father told me, from Amir Ahwal, from Abu Siddiq Naji, from Abu Saeed Khudri, who said... and then he mentioned it.Its chain is hasan because of Amir Ahwal, for he is one whose hadith is hasan. Tirmidhi said, "This is a hasan gharib hadith."This hadith indicates that pregnancy and childbirth will occur in Paradise for whoever among the people of Paradise wishes that, and the general texts of the Quran support what has come in this hadith. His saying, "and with Us is more" [Qaf 50:35], this is like His saying, "For those who have done good is the best reward, and more" [Yunus 10:26]. The "more" is the sight of the noble face of Allah, as has come in the Sahih.