I think DD2 2.6 has it 
Bright red vulva and very emotional, irritable.
She hardly slept last night and was up countless times crying. I think because she wears a nappy at night, which was irritating it.
Finally got her down for a nap. Gave some Calpol for discomfort.
Does 1% cream work? Or is there anything the doctor could prescribe?
Could I try a bath with baking soda?
Poor little lamb 