A man and his wife had a case of Lian (or Mula'ana) during the lifetime of the Prophet ﷺ and the man denied the paternity of her child. The Prophet ﷺ gave his verdict for their separation (divorce) and then the child was regarded as belonging to the wife only. (Using translation from Bukhārī 6748)

لَاعَنَ امْرَأَتَهُ فِي زَمَانِ رَسُولِ اللَّهِ ﷺ وَانْتَفَى مِنْ وَلَدِهَا «فَفَرَّقَ رَسُولُ اللَّهِ ﷺ بَيْنَهُمَا وَأَلْحَقَ الْوَلَدَ بِالْمَرْأَةِ»