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Month 1
The size of a pin head.
Critical stage for brain and spinal cord development.
Internal organs and circulatory system begin to form.
The heart begins to beat. -
Month 2
About 1/4 inch long.
Face, eyes, ears, and limbs take shape.
Bones begin to form. -
Month 3
About 1 inch long.
Nostrils, mouth, lips, and eyelids form.
Buds for all 20 baby teeth appear.
Fingers and tows almost complete.
All organs present but still immature. -
Month 4
About 3 inches long, weighs 1 ounce.
Can suck its thumb, swallow, hiccup, and move around.
Facial features become clearer. -
Month 5
About 6 1/2-7 inches long, weighs about 4-5 ounces.
Hair, eyelashes, and eyebrows appear.
Teeth continue to develop.
Organs are maturing.
Becomes more active. -
Month 6
About 8-10 inches long, weighs about 8-12 ounces.
Fat deposits under skin, but fetus appears wrinkled.
Breathing movements begin. -
Month 7
About 10-12 inches long, weighs about 1 1/2-2 pounds.
Has periods of activity followed by periods of rest and quiet. -
Month 8
About 14-16 inches long, weighs about 2 1/2-3 pounds.
Rapid weight gain.
May react to loud noises with a reflex jerking action.
Move into a head-down position. -
Month 9
About 17-18 inches long, weighs about 5-6 pounds.
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.