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Birth
When a child is born they have 100 to 200 billion neurons already in their brain. -
7 months
At 7 months old most babies are able to sit on their own. -
6 weeks old
On average a child is able to lift up their head at 6 weeks old. -
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Birth to 6 years
From birth to about 6 years old a child experiences blooming. Blooming is where neurons are growing. After blooming the brain's neurons go through pruning. Pruning is where the connections of the neurons are reduced. -
2 years old
When a child is two years old their brain is about 55% of its full size. -
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3 years to 6 years
From 3 to 6 years old a child's frontal lobes begin to grow at a rapid rate. -
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4 years to 6 years
The growth of a child begins to slow during this few year period. A child will gain 5-7 pounds and grow 2-3 inches each year. -
6 years old
When a child reaches six years old their brain is at 90% of its full size. -
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8 years to 12 years (girls)
A female child begins to grow rapidly around 8 or 9 years old. The growth spurt is caused by females reaching puberty. This is much earlier than male children. -
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10 years to 16 years (boys)
Many boys begin to grow more rapidly between the ages of 10 to 16. -
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12 years to 13 years (girls)
Most girls begin their menstrual cycle around the time they are 12 to 13 years old. -
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13 years to 14 years (boys)
When a male is around 13 to 14 years old they experience the first ejaculation. -
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20 years to early 40s
Between the ages of 20 to early 40s is when many adults reach the peak of their fitness. Weight and height may increase slightly at this time. But strength, reaction time, cardiac functioning, and other physical abilities are at their best. -
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40s to 60s
During an adult's early 40s to 60s the decline begins. The skin begins to lose it elasticity, hair greys, vision decreases, and weight is gained. -
50 (girls)
Many women around the age of 50 begin menopause or the ending of the menstrual cycle. -
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60s to Death
During late adulthood the skin continues to lose elasticity, reaction time slows, and strength diminishes. All five of the senses also decline and many people experience memory loss.