ʿSprinkle water on the urine of a boy and wash the urine of a girl.ʿ Qatadah said: This applies so long as they are not eating solid food; if they are eating solid food, then it is to be washed in both cases.
أَنَّ رَسُولَ اللهِ ﷺ قَالَ فِي الرَّضِيعِ يُنْضَحُ بَوْلُ الْغُلامِ وَيُغْسَلُ بَوْلُ الْجَارِيَةِ قَالَ قَتَادَةُ وَهَذَا مَا لَمْ يَطْعَمَا الطَّعَامَ فَإِذَا طَعِمَا غُسِلا جَمِيعًا