To be honest, I would LOVE another boy and my first boy was 8lb 9oz so it's possible!
As for the summer baby, I would just out them in a baby grow without the vest underneath. At night time a baby grow with cellular blanket. If it's really sticky a vest, but I always put a light cellular blanket over them, so dress accordingly. My daughter was an April baby and it's usually mild but in 2011, we had a hot Easter, so she was baking in a vest and baby grow. I don't bother with going home outfits. In fact, I don't bother with outfits for the first couple months!! All they do is either poop over them or vomit over them!!
So all I'll be getting is baby grows, blankets and muslins for the first month! May get a few vests or rompers and obviously nappies. Hoping to breast feed again, just because I did 2 years with Amelia, doesn't mean that I'll be successful again! Each baby is different!