Best guess on Hanna sizing?

[cmo]

I have 3 friends due in December; all are having boys! I'd like to get each of them a summer romper or two from Hanna, but I'm unsure what size to get. My own son is so big (4 months, wearing a 70), it makes it hard for me to judge what a more average-sized baby will wear. Would you buy a 60? A 70? We live in the south so the warm season is long. Thanks for your input!

[C99]

I would buy 70s. Nate was wearing 70s at 6 months (and wore them until he was 12 months), and he was of average build until very recently. I think the 70s give you the most bang for your buck, so to speak, because they can be worn for such a long time. Actually, Nate still has a couple of short sleeve t-shirts that he still wears that are 70s.