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

Cause a 13 month old might be barely walking and only talking a little bit where as a 23 month old would be running and possibly putting together some short sentences and both are only 1 year old.