Word fair haired and Tuesday's child?

Don't know what the question is about 'fair-haired.' Rhyme goes 'Monday's child is fair of face, Tuesday's child is full of grace, Wednesday's child is full of woe, Thursday's child has far to go, Friday's child works hard for a living, Saturday's child is loving and giving, but the child that's born on the Sabbath day is fair and wise and good and gay.' Gay means happy here.