 Conception – 4 weeks  8 weeks  12 weeks  16 weeks  20 weeks  24 weeks  28 weeks  32 weeks  weeks

 Less 1/10 inch long  Beginning of spinal cord, nervous system, heart, intestinal system and lungs  Amniotic Sac – clear fluid, in which the unborn baby floats and moves

 Less than 1 inch  Face forming – eyes, ears, mouth  Arms and legs are moving  Heartbeat detectable

 3 inches and weighs 1 oz  Moving fingers and toes  Finger prints  Can smile, frown, swallow and urinate

 5 ½ inches long, 4 oz  Strong heartbeat  Thin skin  Downy hair over body  Fingernails and toe nails develop

 inches  Sucks thumb  Hiccup  Hair, eyelashes and eyebrows  Rolls over fluid

 inches 1 ½ lbs  Wrinkled skin  Open eyes  Strong grip

 inches, 2 ½ - 3 lbs  Adding body fat  Very active

 16 ½ - 18 inches, 4 – 5 lbs  Sleep/awake  Responds to sounds

 19 inches 6lbs  Skin less wrinkled  Gaining immunities from mother

 Embryonic Period  Occurs 2-8 weeks after conception  Rate increases of cell division, support systems for the cells form, organs appear  Germinal period  Takes place in first 2 weeks after conception  Creation of zygote (fertilized egg), cell division attachment of the zygote to the uterine wall

 Embryonic Period  Occurs 2-8 weeks after conception  Rate increases of cell division, support systems for the cells form, organs appear  The mass of cells attached to the uterine wall forms three layers and is now called the embryo Endoderm – inner layer of cells will develop into digestive and respiratory systems Ectoderm – outer layer of cells will become the nervous systems and sensory receptors (ears, nose, eyes and skin) Mesoderm – middle layer – will develop into the circulatory system, bones, muscle, excretory system and reproductive system

 Fetal Period  2 months of conception  Last for 7 months  Development is very dramatic