So I've now knitted 28 squares and this is how it looks with all the squares laid out so far. Below is the grid I'll use to decide which squares go where.
When finished, the blanket will have 7 squares per row and 8 squares per column and will measure about 24.5 inches x 28 inches.
By the way, we found out yesterday that we're having a boy! I still think it's a good idea that I've included hot pink / fuschia coloured squares in his blanket. :-)