Mommy may not be in bikini shape, but babies always are! I bought this bathing suit at babies r us today (I've been eyeing it for awhile). Got home, tried it on her and it barely fits! It's 6-9 months and she is currently wearing 3-6 month clothes. Baby swimwear must run small because my friend had to buy 12 month suits for her 6 month old. I'd take it back and get a bigger size, but it was the last one :( I know there will be new suits that come out as summer gets closer so I'll just wait for now so I make sure I get the correct size. I snapped some photos of her in it first of course!