Three months down, or is it 13 weeks?

X is 13 weeks old today but will not technically be three months until tomorrow, and this brings me to an important question. When do you stop reporting your child's age with meticulous detail. Being a first time parent I think it is funny the responses I have hear to the question, how old is your child. Mine is 63 weeks! mine is 18 months! Mine will be 3 years old in 5 months! What does That mean. When you get down to it, I do have a argument to make for a little detail. Last Friday, X was 12 old, this should translate to 3 months, assuming that the month is a four weeks (wich most people tend to do). However, if you do make that assumption, your child will reach 13 months on the date that they become a year, and that is just wrong. SO, I think that i am going to loose the weekly descriptor hear shortly and just switch to months. But i declare here and now that my boy will not be a month older until the 26th (except in February) of the month. After tomorrow X is 3 months old, and after that he will be 4 on the 26th. No more weeks. ANd beyond that his progression will be... he is a year, a little over a year, a year and a half, almost two, and then it is just 2, 3, 4, 5, etc. etc.
On a slightly different note I would like to let it be know that X is currently right on track, developmentally at least. Recently he discovered his hands, and he is quickly learning that he controls them and is able to reach out and grab things, He also rolled over on his own for the first time the other day, tummy to back. He has also learned that he has a voice that he is able to use, even if he does not "need" anything. Lately he is content sitting in his chair interacting with a frog that my mother bought him. I will put a pic of him and the frog up later. One other funny thing he does is this. Every time we turn the lights on in his room he sneezes. I think that the light makes him squint, which in turn puts pressure on his sinuses, and results in a tickle, that causes a sneeze. But that is just a guess, not scientific fact.