amniotic sac - It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth., amniotic fluid - liquids that surrounds the unborn baby in the amniotic sac., embryo - organism from 2 to 8 weeks after conception, fetus - baby from 9th week to end of pregnancy, folic acid - prevents premature birth and neural tube defects., placenta - organ that surround the embryo and permits exchange of nutrients and waste between mother and baby., prenatal - Before birth, teratogen - substances that can interfere with embryo and fetus development. , zygote - newly fertilized cell at conception, conception - the successful joining of an egg and sperm,

Prenatal development

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