It seems to me that childhood is good because you don't think critically - everything is delight, novelty, interesting and magical.
Critical thinking is useful, but when you are an adult and solve adult problems.
As a child, I believed in fairies, Santa Claus (until now) and witches, but now, having grown older, this did not lead me along the path of astrology and the "Battle of psychics". And critical thinking has nothing to do with it - the sphere of interests has simply changed.
To be the person in his life who has critical thinking, to be an example to follow - certainly, but not by bursting castles in the air; he himself will have to give it up as he grows older. Do not break his heart twice.
But the actions of classmates in elementary school are just right for analysis.
First of all, the parent himself must be able to think critically, and already by his own example show the child how to solve some problems. First, let's define the wording of the term under discussion.
"Critical thinking is a cognitive strategy that largely consists of continually checking and testing the adequacy of possible decisions about how to do a certain job. Focused on finding errors or shortcomings in current mental work. "
The first thing a child should learn (and in principle any person who wants to learn to think critically) is the ability to admit their mistakes and change their beliefs in the presence of convincing evidence. This, as I noted above, is best shown by example.
In childhood, people are still new to the world around them, and therefore children may have a lot of irrational fears: from a monster under the bed to a ghost seen outside the window. It is important to tell children about all sorts of errors in the perception of human senses, and in general to explain to children how our world works!
I remember that even in kindergarten I had an imaginary witch friend, but it was only later found out, that she is imaginary! Because my mother told her friends that I was in contact with some kind of witch, that I might have some kind of power. How funny it is to remember all this now! It's just that no one explained to me that such witches do not exist! Even later, when I was already at school, I believed in all sorts of nonsense: from a world conspiracy to aliens from Nibiru! But, thank Sitis, I easily got rid of these delusions, having learned to search and analyze information on my own.
In general, all this text can be fit into two theses:
• set an example to a child on yourself
• talk to your child, talk about the world and mistakes of thinking and perception
UPD. I remembered now also Sheldon's quote from The Big Bang Theory: “When we kill children’s ability to think critically by telling them that rabbits come out of hats, we create adults who believe in astrology and homeopathy.”