This picture is from
Day 10. We've got visible darkening and the definite return of a hairline. Well, except for that 3/4 of an inch at the very top of his forehead where there's no hair, but there IS a terrible tan line. And I'd say the reduction in "Oh my god, that kid looks seriously ill!" sideways glances was, by Day 10, reduced by about 65%.
"Those baby ducks have more hair than I do!"