It doesn't matter...: A 29-day old baby is a month old. In real life, it doesn't matter whether a baby is 27 days, 29 days, 31 days, or 33 days old... just call it a month. (When there is a medical reason for concern, we usually count in DAYS until over 28 days, and then we count by WEEKS until about 12 weeks. Then, we start counting by MONTHS.)
Answered 1/28/2015
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