Claire is about 64cm long. I hope she doesnt grow out of the smallest one too soon? Maybe I should get the next size up?
I agree with Caro, the 6-18 month one will be MASSIVE - Aidyn went into that size at about 8 months, and it was sooo roomy. Remember the 0-6month grobag is 70 cm, and it only goes from her shoulders down, so if her total length is 64 (incl neck & head!) then she still will have plenty of room.

I like the fact that they don't have sleeves - it gives you more options on how to dress them depending on the weather.