How many months is my child old?

My child was born on 31.12.14. 

From the date each week i added one week age. So at the end of 14 weeks , she is 3 months old (each month 4 weeks) and 14 days old. But https://www.easycalculation.com/date-day/age-calculator.php says that she is 3 months 8 days old ? Is it correct....How?

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