sorting model data in template page

This code works perfectly,

{% for talk_child in talk.child.all %}
{{talk_child.text}} {{talk_child.created_dt}}
{% endfor %}

Now, I want to sort all child based on created_dt ASC (something like
below), but it doesn't work. How can I get this right?

{% for talk_child in talk.child.order_by 'created_dt' %}
{{talk_child.text}} {{talk_child.created_dt}}
{% endfor %}

Below is my class
class Talk(models.Model):
user = models.ForeignKey(User)
destination = models.ForeignKey(Destination)
text = models.TextField()
type = models.CharField(max_length=30)
sup = models.ForeignKey('self', blank=True, null=True,
related_name='child')
created_dt = models.DateTimeField(auto_now_add=True)
thumb_up = models.IntegerField()
thumb_down = models.IntegerField()

class Meta:
ordering = ["-created_dt"]

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