Roscoe was born on October 6th, but his due date was December 24th. That means today his adjusted age is 4 months, but his legal age is a little over 6.5 months. Doctors will measure his development based upon his adjusted age, but his birthday will be according to his legal age. So the question for you is: do you want to know medical history or do you want to eat some cake? :)
Developmentally, Roscoe is on track. He is grasping at things, turning his head toward sounds, smiling at people who talk to him (some more than others), and engaging in "coo" and "aah" conversation. His breathing still needs work, because a blood test today showed his CO2 at 72. But look at what a conversationalist he is:
After reading this blog post, some ladies may be tempted to derive an arbitrary due date for themselves so that they can refer to themselves by an "adjusted" age in the late 20's instead of their legal age above 40. Please do not succumb to this temptation. You are not 29 and neither am I. Let's both just accept the facts.