I am very sorry to be the bearer of bad news, but I am one of those ladies who experienced permanent shoe size change... I went from 7/7.5 to 8/8.5 postpartum (and both pregnancies were in my thirties, so I wasn't still 'growing''!) But I would give it a few months & just buy a pair or two for short term comfort. You may still have fluid storage going on, especially if you're nursing. My whole foot just got longer & bigger, which probably means all the tendons relaxed, allowing the bones to spread & settle.