Kidley
A little kid, typically between the ages of 3-12. Characterized by their lack of intelligence and social skills, and their tendency to annoy those around them. Nearly every person goes through this stage of development in their life. A child naturally gains more knowledge and self awareness with age, and eventually will not be considered a kidley once he or she can do things independently and fails to annoy others.
"Look at that kidley, it won't stop screaming, and I'm trying to read!" exclaimed Joe.