Here is the data (Excel spreadsheet OR Comma Separated).

Notes about the data:
This is real world data. For the most part, Chloe drank five times in a day, but at the beginning of the interval and during her growth spurt she had six bottles. You'll need to account for this. Real-world data means there will be some outliers and maybe even some typos. You will have to get your hands dirty a bit. Below are a couple websites that may be helpful.
We traveled to France with Chloe, so that messed up her eating schedule. Our travel dates were December 29 - January 15, and I tried to account for the time change as well as possible.

Here is a link to a website to learn about changing hours to minutes: http://mathforum.org/library/drmath/view/63521.html
Here is a link to a website to learn about subtracting times in Excel. (If you convert to minutes before, then remember there are 24*60 minutes in a day!) http://www.exceltip.com/st/Subtracting_Times/841.html