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A pin head is about the size of the baby
Egg attaches to lining of uterus
Critical stage for brain and spinal cord development
Internal organs and circulatory system begins to form
Heart begins to beat -
Baby is about 1/4 in. (6 mm) long as month begins.
Face, eyes, ears, limbs, and bones begin to take shape and form -
About 1 in (25 mm) log as month begins
Nostrils, mouth, lips, eyelids form
Buds for 20 baby teeth appear
Fingers and toes are almost complete
All organs are present but still immature -
About 3 in (7.6 cm) long, weighs 1 ounce (28 g) as month begins
Can suck thumb, swallow, hiccup, move around
Facial features become clear. -
About 6 1/2- 7 in (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 are maturing
Becomes more active -
About 8-10 in (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 -
About 10-12 in (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 -
About 14-16 in (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 -
About 17-18 in (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