For a four-month-old…
Julia can roll over.
From her back onto her stomach.
It requires enormous effort, especially to get past that elbow that she’s lying on when she’s almost, almost all the way over. She screeches and yells like a little tiny wild woman. And she’s not even happy when she’s successfully on her stomach. She continues with the screeching – I think she’s saying some rather un-ladylike things at that point.