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Baby’s Pregnancy Calendar |
Ready for Birth
40 Weeks
Thighs are about three inches long (about 7½ cm)...
Thighs are about three inches long (about 7½ cm)...
Fetal Respiratory Rate
39 Weeks
Breathing motions occur about 70% of the time...
Breathing motions occur about 70% of the time...
Exposure to Loud Noise
38 Weeks
The number of heartbeats since conception is now greater than 50 million...
The number of heartbeats since conception is now greater than 50 million...
Firm Hand Grasp
37 Weeks
The baby has a firm hand grasp...
The baby has a firm hand grasp...
Flavor Preferences
36 Weeks
Baby's feet are now 15 times their length at the age of 8 weeks...
Baby's feet are now 15 times their length at the age of 8 weeks...
Alveoli Formation
35 Weeks
Baby weighs about 2,500 grams (about 5½ pounds)...
Baby weighs about 2,500 grams (about 5½ pounds)...
Rapid Brain Growth
34 Weeks
The lifetime supply of the kidney's filtration units is now present...
The lifetime supply of the kidney's filtration units is now present...
Behavioral States
33 Weeks
The brain weighs about 200 grams (a little less than ½ pound)...
The brain weighs about 200 grams (a little less than ½ pound)...
Breathing Movements
32 Weeks
Feet now measure almost 2½ inches long (about 6 cm)...
Feet now measure almost 2½ inches long (about 6 cm)...
Fetus Appears Less Wrinkled
31 Weeks
After 40 million heartbeats, is a tuneup needed...
After 40 million heartbeats, is a tuneup needed...
Sound Discrimination
30 Weeks
Breathing motions are getting deeper and taking longer...
Breathing motions are getting deeper and taking longer...
Response to Light
29 Weeks
The head is about the size of a softball...
The head is about the size of a softball...
Sense of Smell
28 Weeks
The sense of smell has arrived...
The sense of smell has arrived...
Somersaults
27 Weeks
The thigh bone (femur) is about two inches long (about 5 cm)...
The thigh bone (femur) is about two inches long (about 5 cm)...
Fetal Respiratory Rate
26 Weeks
Sometimes breathing motions occur up to 44 times per minute...
Sometimes breathing motions occur up to 44 times per minute...
Blink-Startle Response
25 Weeks
The brain weighs about 100 grams (a little less than ¼ of a pound)...
The brain weighs about 100 grams (a little less than ¼ of a pound)...
Age of Viability
24 Weeks
Heart beat count now exceeds 30 million beats...
Heart beat count now exceeds 30 million beats...
Skin and Hair
23 Weeks
Baby now weighs around 500 grams (about 1 pound, 2 ounces)...
Baby now weighs around 500 grams (about 1 pound, 2 ounces)...
Responds to Sound
22 Weeks
The head is now the size of a tennis ball...
The head is now the size of a tennis ball...
Circadian Rhythms
21 Weeks
Girls’ ovaries now contain their lifetime supply of “eggs.â€...
Girls’ ovaries now contain their lifetime supply of “eggs.â€...
Vernix Caseosa
20 Weeks
Sweat glands have arrived...
Sweat glands have arrived...
Bronchial Tree
19 Weeks
The baby's heart has now beat has more than 20 million times...
The baby's heart has now beat has more than 20 million times...
Hormonal Stress Response
18 Weeks
Enamel begins forming on the developing teeth...
Enamel begins forming on the developing teeth...
Blood Cells and Bone Marrow
17 Weeks
Nutrients in the amniotic fluid are broken down by digestive enzymes...
Nutrients in the amniotic fluid are broken down by digestive enzymes...
Quickening
16 Weeks
Starting at this age, girl fetuses move their jaws more often than the boys...
Starting at this age, girl fetuses move their jaws more often than the boys...
Responds to Touch
15 Weeks
The baby is making more hormones all the time...
The baby is making more hormones all the time...
Taste Buds
14 Weeks
Weight increased by 60% this past week...
Weight increased by 60% this past week...
Nose and Lips
13 Weeks
The face now makes complex expressions...
The face now makes complex expressions...
Eyes Roll, Yawns
12 Weeks
Body weight increased more than 75% just this week...
Body weight increased more than 75% just this week...
Sucking and Swallowing
11 Weeks
The mouth opens and closes, and the tongue moves...
The mouth opens and closes, and the tongue moves...
Spontaneous Movement
10 Weeks
Occasional breathing motions begin...
Occasional breathing motions begin...
Fingers and Toes
9 Weeks
The heart is nearly complete...
The heart is nearly complete...
Hand Movement
8 Weeks
The face withdraws if lightly touched around the mouth...
The face withdraws if lightly touched around the mouth...
Hand Plates and Cartilage
7 Weeks
The head makes up one third of the whole embryo...
The head makes up one third of the whole embryo...
The Heart in Action
6 Weeks
The amnion surrounds the embryo with a fluid-filled sac...
The amnion surrounds the embryo with a fluid-filled sac...
The Folding of the Embryo
5 Weeks
The brain has three major divisions...
The brain has three major divisions...
Amnion and Germ Layers
4 Weeks
germ cells, which will form eggs in girls and sperm in boys, are present...
germ cells, which will form eggs in girls and sperm in boys, are present...
The Morula and Blastocyst
Cell Division