The synapses in your baby’s prefrontal cortex peak during the third year, reaching more than double the level they will have as an adult. The prefrontal cortex also creates pathways with other areas in the brain and strengthens them. Because of this, your baby undergoes significant improvement in complex cognitive abilities. The ability to understand cause and effect as well as the ability to interpret the present using the past both become stronger during this period.
Of course, this is just an overview of how your baby’s brain develops. In truth, there are countless small changes that happen every day that help your baby progress and develop. The brain is a very fascinating thing, and in babies, it develops very rapidly.
Now let’s look at a couple of popular theories on cognitive development.