For example we refer to infants over a year as 13 months, 16 months, 24 months, etc. Is there a reason for this convention?
In: Biology
Per the NHS (and typical among US health care providers as well):
>>With babies and toddlers, we count their age in weeks up until 6 months, then months up until 2 years.
>>Our research shows that this is how people talk about their child’s age. Healthcare professionals also use weeks and months in this way. It means we can be consistent and accurate when writing about a baby’s milestones, vaccinations and development reviews.
[Source](https://service-manual.nhs.uk/content/inclusive-content/age#:~:text=With%20babies%20and%20toddlers%2C%20we,and%20months%20in%20this%20way.)
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