Really stupid query- but is 20 weeks old 5 months? or is 22 weeks old, 5 months….?????
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5 months is 5 months to the date they were born. I.e. if born 10th March, they’re 5 months 10th August

It’s closer to 22 weeks. As above said it’s about the calendar. My son was 5 months yesterday and is 22 weeks today.