If Emry was on Twitter, this is what he'd tweet: "You know you're fat when your dada can froozle your shins."
In our family, froozle means to blow a raspberry, you know that thing you do when you can't resist squishy baby tummies, and, in our case, shins. A piece of terminology a la Mikhail's family.
And for comparison, here's Elan at around the same age:
That's some strong genes.