Stages of Human Development

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

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

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

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

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

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

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

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