why do we refer to infants above a year in months?

Question

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

Answer 1

Because a month is a much more significant amount of time and their life when they are that young. A few months means the difference between a lot of physical and other milestones, being able to do/understand things vs. not.