Well, it explains why children cry, doesn't it? Had never occurred to me, before he pointed it out.
They signal when they need something. Brilliant system.
Discussion
Make sense (?
This is the norm in nature, almost everything that passed the test of time has a purpose, when we fail to understand why most of the time is us not being smart enough to get it.
Children are both easier and more difficult, than I thought.
All the basic survival stuff quickly becomes routine.
Dealing with two additional people with their own personalities and desires is difficult.