Right now she is 9.4 months old, or roughly 9 1/2 months, and on the 19th she'll be 10 months old.
There are more than four weeks in a month (other than February), so the more months out you count, the greater the rounding error you are going to get, as you're starting with an error and then compounding the error.
__________________ (ZoE  )(Chelsea ) |