When it has 'stuff' in it lol
Usually twice a week but being a curious 15mth old, i sometimes have to do a "mini hair wash" when she puts 'stuff' in her hair the day after ive washed it. I just put her hair uder the basin and give it a quick wash.
She also sufferes from excema, frequent hair washing and baths agrivate and dry her scalp and skin out.
My mother, on the other hand would bath and wash her hair twice a day if i let her. Regardless of how much i tell her it's bad for her eczema.