Ok, I know this is impossible to know for sure... but we had our baby girl July 22 - she weighed 8 lbs 1oz and was 20 1/2 inches long...
My question is this... we are taking a trip to Florida in December (she will be almost 5 months old when we are there) and I would LOVE to buy some clearance summer clothes for the trip - and ESPECIALLY a swimsuit now since they will be impossible to find in Ohio around that time. Does anyone have ANY estimate about what size she will wear around that time? I'm totally willing to buy a couple and return what doesn't fit later.... but I just have no idea. Hoping some "non-first time moms" can shed some info

Thanks in advance!!!
Oh, also she is currently still fitting into newborn clothes just fine....and will be 3 weeks on Monday...
Re: Baby Clothing Sizes...
DS was a little bit bigger than yours (8lb 12oz), but he was definitely in the 3-6 month/6month sized clothes at that age. I think you'd be safe buying that size unless she has a huge jump in her growth rate.
My youngest is two months now and she is in 6 month sizes and bigger. I can fit some 3-6 month clothes on her but they are tight and look small and short.
Buy a few sizes. I hate clothes that look small but I don't mind if it's a bit roomy so I would err on the side of larger than smaller.