I argue that cognitive development can be modelled using a logistic function. Thoughts? Do note that the ages from 0-5 are deceiving, since the cognitive development fraction of a 5 year old in this logistic function is over 100 times larger than that of a newborn. Interesting is the rapid spike on the onset of puberty, where I set the midpoint of 50% development to be at the age of 12.5: the onset of puberty.