How many months old is my child?

[Senoreeta]

My child was born on 30.11.14. From the date she born, each week i added one week age for her. So at the end of 19 weeks , she is 4 months old (each month 4 weeks) and 21 days old. But an age caluclator in easycalculation site says that she is 4 months 9 days old ? Is it correct....How?

 

[sue_88]

Simply because there aren't four weeks to a month.

 

[misspriss]

4 weeks (28 days) is a lunar month. 30/31 days is a calendar month.

It's why pregnancy is 40 weeks but only "9 months".