Brittany and I Have no Idea How Old Our Daughter is [POLL]

If four weeks is one month, isn't Shay now one month old? Nobody seem to know because, apparently, non of know how to count baby days.

Four weeks IS one month, this much we know, but when I asked Brittany, my mom and coworkers if Shay turned one-month old yesterday (September 17th) nobody really had a solid answer, it was actually a pretty mixed review.

September 17th was the fourth Wednesday since she was born... one month, right? Some people said "no, not one month, you count the date".

So, since she born August 20th, she doesn't turn one month old until this Saturday, September 20? This baby stuff is CONFUSING.

How do I know how old my daughter is before I just start counting the years?