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First trimester starts
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Organs start to form -
Fertilized egg leaves fallopian tubes and starts to implant in the uterus. It then starts to form the placenta. The neural tube forms. The heart and lungs form, the heart begins to beat towards the end of the month. Length: 0.25 inch Weight: 0.02 oz
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Heart and blood vessels start to form. -
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Baby goes from embryo to fetus -
Facial features develop, ears and limbs start to grow. The neural tube finishes forming. Bones start to harden, and the fetus starts to move. Toes, fingers, and eyes also form. Length: 1.25 inches Weight: 0.14 oz
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Second trimester starts -
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Nails on the fingers and toe start to develop. Teeth also start to develop, while the ears have just finished forming. Reproductive, circulatory and urinary systems develop. Length: 3-4 inches Weight: 1 oz
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The head and body start to grow proportionate. The fine hair begins to grow and the fetus’s skin thickens up. The baby now can have movements such as yawning, stretching, and sucking its thumb. Length: 4.5 inches Weight: 3.5 oz
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The baby has formed lanugo. In female fetuses, the uterus forms. By the end of the fifth month of pregnancy, most women begin to feel the fetus move. Length: 6.5 inches Weight: 10.6 oz
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Third trimester starts -
Fetus develops blood cells, eyebrows and lashes, finger/toe prints, and taste buds. Length: 11.8 inches Weight: 1.3 lb
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The fetus moves around frequently and starts to grow fat deposits. The baby responds to stimuli and has fully formed hearing. Length: 14.8 inches Weight: 2.2 lb
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Fetus can see. Most internal organ systems are fully developed. Most organs are rapidly maturing. The lungs are not as developed as the rest of the organs. Length: 16.2 inches Weight: 3.8 lb
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Baby is fully matured and developed, ready to be born.