That's a prune. And so are you! That's how big you are this week, now that you're 10 weeks old! Hopefully you're not as wrinkly, but I'm not making any promises.
Now, call me sneaky, but after last week's "you're-the-size-of-a-green-olive-and-your-mother-ate-a-jar-of-green-olives" issue, I've laid out quite the experiment to test a theory. You're the size of a prune, and your mother is hungry. So, I bought us a big bag of prunes.
We shall see if she feels compelled to binge eat whatever fruit/veggie you are comparable in size to week after week.
As of today, Tuesday, the prune bag remains unopened. But, perhaps this evening I'll taste one and see how she responds.
I'm only looking out for your welfare in doing this. We need to know early on, while you're still a snack-sized fruit, if, in week 37, your mother is going to feel the urge to binge eat 23 Watermelon. That won't be good for any of us.

Sure, it looks harmless now; but this could get dangerous.
P.S. The Bump has this to say about your development: "With bones and cartilage starting to form and vital organs beginning to function, baby is making major progress. Body length will almost double in the next three weeks, and arm joints are now working. (Soon, legs will too.)"That's awesome! Your arm joints are functioning! That means we could probably have our first official High Five!