Wait, how old is Kira?

So, as always, my mom brought a laundry basket full of the cutest girl clothes for the girls. I told her a few weeks ago to buy 12 month outfits for Kira, please take note, who is 6 months old. They don't fit her. Her waist is way too big for these 12 month pants! They really aren't all that too long for her either. So all day today, I had her in these cute khaki pants from Target, unsnapped. Should I take them back? I am thinking no because hopefully she will thin out once she starts crawling, which may be never b/c she is so fat, and the 12 monthers will fit her then. Hmmm... what to do. I wonder how large 18 month pants would be on her.