Umm 'Atiyya reported that when the Messenger of Allah ﷺ asked her to wash his daughter, he told her to start from the right side, and with those parts of the body over which Wudu' is performed.
أَنَّ رَسُولَ اللَّهِ ﷺ حَيْثُ أَمَرَهَا أَنْ تَغْسِلَ ابْنَتَهُ قَالَ لَهَا ابْدَأْنَ بِمَيَامِنِهَا وَمَوَاضِعِ الْوُضُوءِ مِنْهَا