1. Stages of Human Development

2. 1st Trimester Zygote to embryo Heartbeat detectable (6wk)
Male penis begins to develop
Hormones begin production
Can be 6cm by end of trimester

3. 2nd Trimester 3 inches-10inches Fingerprints developed
Bones begin to develop
Eyelids and eyebrows form
Gender can typically be determined

4. 3rd Trimester Skin smoothes out as fetus gains fat
Will begin to blink and respond to light
Lungs finish development
Avg. 19inches & 7lbs

5. Infancy Birth to 1 year Begins hand movements
First smiles and begins to use vocal sounds
Learns to sit up independently
Crawling and walking is mastered

6. Toddler 1 year – 3years Speak first words Vocabulary increases
Attempt sharing and friendship
Begin social development (trust)

7. Childhood 4 years to 12 years Growth rate slows down
Most memories form
Should be able to use stairs and run
Most learn to read

8. Adolescence/Adulthood
Begins at 13/ sexual maturity
Puberty occurs
Physical growth has slowed down/ceased
Menopause signals end of this phase
Phase with best reproductive ability

9. Elder/Old Age Loss of skin elasticity (wrinkles)
Loss of hair color or balding
Memory loss or forgetfulness
Failing eyesight or hearing
Possible limitations in mobility