I'm trying to buy a dress online to wear to a wedding in June. I'm between two sizes based on some of my measurements, but closer to the bigger size. I'm currently 7 weeks postpartum. I'd like to lose the weight to be at the smaller size by the wedding, but I've never really had to work on weight loss before and I'm afraid it won't happen. The dress is on a deals site right now and is non-returnable, so buying both and returning one isn't an option.

Would you buy the bigger dress that you fit in at 7 weeks postpartum, in case you don't lose the weight? Or would you buy the dress in the next size down and be certain to lose it in the next 3 months?