Thanks everyone for your input. Button "A" was the winner by a nose. Though the sweater is unabashedly peachy-pink, it's ostensibly a unisex design, so the anchor buttons may induce people to knit the little thing for their baby boys too.
The winner of the free pattern was Shirley, who also left this valuable information in her comment: For buttonholes: After placement of top and bottom buttons. The remaining buttonholes are evenly spaced between, measure the distance and divide by the number of buttons left plus 1. If 3 buttons are left, divide the distance say 12. 3+1=4 divide by 12 = 3 so you would center a button every 3 inches
Brilliant. Thank you, Shirley. I'm including this on the blog not only to share it with everyone out there, but also so I know where to look the next time I have a buttonhole band coming down the pike.
Here is the finished Baby Chestnut Hill Gansey Cardigan, with Buttons A and errant buttonhole discreetly (I hope) sewn up. We've taken pictures, so the pattern should be available soon. I will keep you posted. I've also finished the backs of the Child and Adult versions of this cardigan, so they're in the pipeline now too.