Answer by
Trina94 (94)
It is commonly thought that we are born with approximately 16 trillion brain cells. At the beginning of the third trimester, synapse formation occurs at a rate of around 40,000 per minute. Synapses are connections between brain cells. In the first six months of life, one million synapses form per SECOND. From age 2 until adolescence, excess neurons/synapses die off.