Fetal Development

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• over the span of 40 weeks a fertilized egg develops into a newborn baby
• the first week the embryo consists of more than 100 cells
• by week 2 they are developing into a variety of cell types, like bone, muscle, and blood cells.
• Arteries and veins are forming by the end of week 2

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• by the end of week 4 the embryo consists of millions of cells and beginning of the eyes, ear, brain, and face.
• The Heart and nervous system began to develop at the end of week 4.
• by week 5 all the internal organs are developed.

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• by week 8 the number of nerve cells in the brain is increasing at rate of 100,000 cells per minute.
• At this time the fetus is about 3 inches long and looks like a tiny adult.
• It is common for the fetus to suck its thumb even though it has never suckled at its mother's breast or had a bottle.
• In addition, a mother's use of alcohol,drugs, or nicotine can harm the developing fetus.

month system

• 2 months: raise head to 45 degrees
• 2.8 months: roll over
• 4 months: sit with support

months system

• 5.5 months: sit without support
• 7.6 months: pull self to standing position
• 9.2 months Walk holding onto furniture

months system

• 10 months: crawls
• 11.5 months: stand alone
• 12.1 months: walks