Is 16 weeks = 4 months?

I can't believe he was EVER this small! And I say that knowing he was a full pound heavier than Mo was at birth. Crazytown. Also, I love that Mo has called him "Daniel Son" 3 times already this morning.
K. Don't judge my "I just had a baby 2 hours ago" look. I know. I have no pride posting this, but it's the only picture that really shows scale...