As a fairly observant and (as far as I can tell) realistic parent, I have noticed that both of my children have (up to their current ages of four years and 19 months) had several peak periods for cuteness.
So far they have had peaks centred at the same ages: 5 months, 15 months and (oldest only so far) 3 years.
This is not to say that they are not cute at any other ages, but at these ages they have been radiantly, eye-wateringly cute.
What would be even more interesting would be to do a time-series. When do human infants have peak cuteness?
As a fairly observant and (as far as I can tell) realistic parent, I have noticed that both of my children have (up to their current ages of four years and 19 months) had several peak periods for cuteness. So far they have had peaks centred at the same ages: 5 months, 15 months and (oldest only so far) 3 years.
This is not to say that they are not cute at any other ages, but at these ages they have been radiantly, eye-wateringly cute.