They are all super cute! If DD hadn't been a ladybug last year I would have chosen that costume. I ended up choosing the cow, but the pink kitty was my second favorite! Is the baby 6 mo. old now or come October? I would size up to 12 mo if she's 6 mo. now. If she'll be 6 mo in October, I'd buy size 6-9 mo. Here's the Carter's website showing the different costumes.
http://www.carters.com/on/demandware...-shop-costumes