The urine of a female (child) should be washed and the urine of a male (child) should be sprinkled over until the age of eating.  

يُغْسَلُ مِنْ بَوْلِ الْجَارِيَةِ وَيُنْضَحُ مِنْ بَوْلِ الْغُلاَمِ مَا لَمْ يَطْعَمْ  

The Messenger of Allah said: "The urine of a boy should be sprinkled over and the urine of a girl should be washed."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ بَوْلُ الْغُلاَمِ يُنْضَحُ وَبَوْلُ الْجَارِيَةِ يُغْسَلُ  

"The Prophet ﷺ said: 'A girl's urine should be washed away and a boy's urine should be sprinkled with water.'" (Using translation from Nasāʾī 304)  

قَالَ النَّبِيُّ ﷺ «يُغْسَلُ مِنْ بَوْلِ الْجَارِيَةِ وَيُرَشُّ مِنْ بَوْلِ الْغُلَامِ»  

The Messenger of Allah said: "The urine of a boy should be sprinkled over and the urine of a girl should be washed." (Using translation from Ibn Mājah 527)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ بَوْلُ الْغُلَامِ يُنْضَحُ وَبَوْلُ الْجَارِيَةِ يُغْسَلُ  

"بَوْلُ الغُلام يُنضَحُ، وَبوْلُ الجَاريَة يُغْسَلُ".  

"يُغْسَلُ مِنْ بَوْالِ الْجَارِيَةِ، وَيُرَشُّ مِنْ بَوْلِ الغُلَامِ".