Mishkat al-Masabih 501, 502
Lubaba daughter of al-Harith said:
When al-Husain b. ‘Ali was sitting in God’s messenger’s lap he passed water and I said, “Put on a garment and give me your lower garment to wash;" but he replied, “It is only the urine of a female which should be washed; the urine of a male should be sprinkled." 

Ahmad, Abu Dawud and Ibn Majah transmitted it. In a version by Abu Dawud and Nasa’i from Abus Samh he said, "It should be washed because of a girl’s urine and sprinkled because of a boy’s."
عَن لبَابَة بنت الْحَارِث قَالَتْ: كَانَ الْحُسَيْنُ بْنُ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُمَا فِي حِجْرِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم فَبَال عَلَيْهِ فَقُلْتُ الْبَسْ ثَوْبًا وَأَعْطِنِي إِزَارَكَ حَتَّى أَغْسِلَهُ قَالَ: «إِنَّمَا يُغْسَلُ مِنْ بَوْلِ الْأُنْثَى وَيُنْضَحُ مِنْ بَوْلِ الذَّكَرِ» . رَوَاهُ أَحْمَدُ وَأَبُو دَاوُدَ وَابْن مَاجَه
وَفِي رِوَايَةٍ لِأَبِي دَاوُدَ وَالنَّسَائِيِّ عَنْ أَبِي السَّمْحِ قَالَ: يُغْسَلُ مِنْ بَوْلِ الْجَارِيَةِ وَيُرَشُّ من بَوْل الْغُلَام