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Month 1
The size at two weeks is the size of a pin head.
The egg attaches to lining of uterus.
Critical stage for brain and spinal cord development.
Internal organs and circulatory system begin to form.
The heart begins to beat. -
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Month 2
Size: About 1/4 of an inch (6 mm) long as month begins.
Face, eyes, ears, and limbs take shape.
Bones begin to form. -
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Month 3
Size: About 1 inch (25 mm) long as month begins.
Nostrils, mouth, lips, and eyelids form.
Buds for all the 20 baby teeth appear.
Fingers and toes almost complete.
All organs present but still immature. -
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Month 4
Size: about 3 inches (7.5 cm) long, weighs 1 ounce (28 g) as month goes on.
Can suck its thumb, swallow, hiccup, and move around.
Facial features became closer. -
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Month 5
Size: about 6 1/2- 7 inches (16-18 cm) long, weighs about 4-5 ounces (113-142 g) as month begins.
Hair, eyelashes, and eyebrows appear.
Teeth continue to develop.
Organs begin maturing.
Becomes active. -
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Month 6
Size: about 8-10 inches (21-25 cm) long, weighs about 8-12 ounces (227-340 g) as month begins.
Fat deposits under skin, but fetus appears wrinkled.
Breathing movements begin. -
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Month 7
Size: about 10-12 inches (25-31 cm) long, weighs about 1 1/2-2 pounds (680-907 g) as month begins.
Has periods of activity followed by periods of rest and quiet. -
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Month 8
Size: about 14-16 inches (36-41 cm) long,weighs about 2 1/2-3 pounds (1.0-1.4 kg) as month begins.
Rapid weight gain continues.
May react to loud noises with a reflex jerking action.
Moves into a head-down position. -
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Month 9
Size: about 17-18 inches (43-46 cm) long, weighs about 5-6 pounds (2.3-2.7 kg) as month begins.
Weight gain continues.
Skin becomes smooth as fat deposits continue.
Movements decrease as the fetus has less room to move around.
Acquires disease-fighting antibodies from the mother's blood.
Descends into pelvis, ready for birth.