How to store historical data using Django

I am new to Django and am trying to figure out how to store historical data and be able to reference any data point from a date in the past. Say I want to store data on a kids height change as he grows and be able to compare his height at day 400 to his height at day 6xx. How would I set this up in Django? Would there need to be a foreign key relationship between height and the kid?

You can use simple history app. According to the docs you need to add a HistoricalRecords field to your model:

from django.db import models
from simple_history.models import HistoricalRecords

class Kid(models.Model):
     id = models.IntegerField(primary_key=True)
     height = models.IntegerField()
     history = HistoricalRecords()

And then all model changes will be stored in the separate table. You can use this field in the code or use admin views to check historical records and retrieve.