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

My son just turned 2. The difference in size and ability between a 12 month old and a 23.9 month old is about 100%.

If you say “my son is 1.” They will ask you “when does he turn 2?”