Yesterday morning I opened the door to my boys' bedroom and tiptoed up to their bunk bed.
"Good morning, Birthday Boy!" I called to my son.
He tunnelled out from under a mound of blankets and sat up in his bed, a big smile on his sleepy face. "Am I a four-year-old now?" he asked.
"Yup! You're such a big boy," I replied.
My son sat up a little straighter. I saw his feet wiggle beneath the bed spread. "Hmmm," he said, "My legs are a bit longer today, don't you think, Mommy?"