Your maths problem is caused by the fact that there are either 30 or 31 days in most months. If you take a month at 4 weeks you have either 2 or 3 days over for each month.This is roughly an extra week every 2 to 3 months. It does not really matter. Work on the months from now on for your baby's next immunisations.He should be 9 months old when he has his measles immunisation.
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