I always thought it funny that they gave her a big bra in the first seasons.
By season 7, you can finally see that IT isn't as much as they wanted us to believe.
And even looked more sexy! :-)
I do believe part of the reason she had bigger boobs was due to Nana's IRL pregnancy. Sometimes a woman's boobs grow before her belly shows. :P
I will ship Odo/Kira till I die, and I think they were right for each other. Both were strong in their own ways, yet they completed each other once they came together.