Mystery poop

I didn't get to bed until almost 2am, then Aria had a really rough time from 4 until 6:30am. I think she is starting to teeth. Nothing I did calmed her down. I felt sooooo bad, and then Stephen woke up from all the commotion too. So... they both had really poopy diapers at 5am. Which one is the culprit for the poop stain on my shirt??? Fun stuff let me tell you!!