Sunan Ibn Majah, Volume 5, Book 37, Hadith 4338 (DarusSalam) ⓘ
It was narrated from Abu Sa’eed Al-Khudri that the Messenger of Allah said: “When the believer wants a child in Paradise, he will be conceived and born and grown up, in a short while, according to his desire.”
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، حَدَّثَنَا أَبِي، عَنْ عَامِرٍ الأَحْوَلِ، عَنْ أَبِي الصِّدِّيقِ النَّاجِيِّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " الْمُؤْمِنُ إِذَا اشْتَهَى الْوَلَدَ فِي الْجَنَّةِ كَانَ حَمْلُهُ وَوَضْعُهُ فِي سَاعَةٍ وَاحِدَةٍ كَمَا يَشْتَهِي " .
also referenced under: Hadith 4338 (Reference) & Book 37, Hadith 4482 (In-Book)