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

I heard this once and it made sense to me:

Because of how fast they grow,
Refer to them in hours until they’re 2 days old
Refers to them in days until they’re 2 weeks old
Refer to them in weeks until they’re 2 months old
Refer to them in months until they’re 2 years old