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
Developmentally it matters through at least two.
Because the difference between 13 mo’s and 18 mos is GIANT… even they are both “one year old”
As kids get older their development slows down. It’s not as drastic, milestones take longer and are not as significant.
(Walking vs not walking, can they feed themselves, are they potty training, do they have language yet … Those things happen over month increments, not year.)
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