U13 Fetal Development Review

"getting ready" phase where the woman is not actually pregnant yet

• wk 1-2

• wk 3

• wk 4

• wk 5

sperm fertilizes ovum to and it becomes a zygote

• wk 1-2

• wk 3

• wk 4

• wk 5

implantation of blastocyst into lining of uterus

• wk 1-2

• wk 3

• wk 4

• wk 5

HCG levels are high enough to be detected in mother's urine

• wk 3

• wk 4

• wk5

• wk6

neural tube closes & arm and leg buds appear

• wk 4

• wk 7

• wk 6

• wk 10

Tags

NGSS.HS-LS1-4

nose forming & measures about 1/2 inch

• wk 6

• wk 8

• wk 12

• wk 10

Tags

NGSS.MS-LS1-5

elbows bend and fingers/toes lose their webbing

• wk 10

• wk 8

• wk 13

• wk 14

Tags

NGSS.HS-LS1-4

RBC formation is occuring in the liver & external genitalia is forming

• wk 11

• wk 24

• wk 30

• wk 18

Tags

NGSS.HS-LS1-4

fetus begins urinating into the amniotic fluid

• wk 11

• wk 13

• wk 12

• wk 14

fetus is able to hear external sounds

• wk 18

• wk 13

• wk 6

• wk 30