Naomi had her four month checkup yesterday (see below for details on the immunizations), and the doctor was pleased with her progress. She is now 13 pounds 6 ounces and 24 inches long!
The doctor laughed when she heard Naomi can roll from her back to her tummy but not the other way around - apparently it's standard for babies to first learn to roll from the tummy to their back. She said it's nothing to worry about though. Babies pick and choose what they want to learn and when, so there aren't any developmental problems with it.
I did get reprimanded for not doing enough tummy time with Naomi. When she is laying on her tummy, she can't prop herself up on her arms as high as the doctor would like. DRAT. We'll have to do lots more tummy time each day, but I gave Naomi yesterday off since she had just gotten immunizations.