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After being fertilized by sperm, the egg will develop into an embryo or future fetus.
During this pregnancy, the embryo will form three layers which will then develop into parts of the baby's body. These layers are:
• Endoderm, which is the innermost layer that is formed into the respiratory and digestive systems, such as the lungs, intestines, liver, pancreas, stomach, and thyroid gland.
• Mesoderm, which is the middle layer that develops into muscles, bones, heart, blood vessels, and urinary system.
• Ectoderm, which is the outer layer which then becomes the nervous system, brain, tooth enamel, nails, eye lenses, and skin.
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