Baby
This is the soft spot that eventually closes on a baby's head
Fontanelle
This is the most common speech impediment as a child
Lisp (Or stuttering - technically it's an impairment, not an impediment)
Teens are more susceptible to addiction because they produce much less of this feel-good chemical.
Dopamine
This is the most common mental health disorder in adults
Depression
Even the fussiest babies cannot produce these until about 2-4 weeks
Tears
Children usually shed all their baby fat by this age
5
This part of the brain develops last - not even fully until adulthood - and explains why parents are often yelling at their teens "what were you thinking?!"
Prefrontal Cortex
It is said that the brain is done developing by this age
25
Before sight or touch, babies have this as their most developed sense
Smell
The state with the highest percentage of its population under 18
Utah
Though it first presents itself in your teenage years, acne effect 80% of the world's population up until this adult age.
30
The adult brain runs on this many watts of power (enough to power a lightbulb)
20
No wonder babies nap so much, they use about 60% of their energy growing this in their first months
Brain
Most people have their first memories from as early as this age
3 - 3.5 years
50% of all lifetime mental illnesses begin at this age
14
In adults, women's longest finger is this one, but men's is typically this one
index, ring
It is a common misconception that babies born in this spring month are the heaviest.
May
This is the most popular youth sport in America
Basketball
Teens produce high amounts of this later in the evening than adults and children, and it lasts longer into the morning. It explains why they're so groggy in the mornings.
The median age for first marriages is around 30.2 years for men and this age for women.
28 (.6)