At approximately day 1

Neuronal migration begins.

Duration: 16 weeks

Reference [PubMed Link]

Herschkowitz N, Kagan J, Zilles K. 1997. Neurobiological bases of behavioral development in the first year. Neuropediatrics 28(6):296-306.

At approximately day 1

Synaptogenesis begins and extends postnatally.

Duration: 32 weeks

Reference [PubMed Link]

Herschkowitz N, Kagan J, Zilles K. 1997. Neurobiological bases of behavioral development in the first year. Neuropediatrics 28(6):296-306.