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Pregnancy Week by Week

Follow your pregnancy week by week and get answers to your questions, like, "When will I show?" and "Is it too early to feel baby's kicks?"

Week-by-Week Pregnancy Guide

Your Baby Hoping that you'll soon find out you're pregnant? You won't know for several weeks yet, for week 1 is actually the week of your last menstrual period before pregnancy. Confusing, isn't it? But the first day of the last menstrual... more
Your BabyHoping that you'll soon find out you are pregnant? You won't really know for another week or so, for this is actually the week preceding ovulation. It's referred to as week 2 because experts date a pregnancy from the first day of... more
Your BabyAt about the midpoint of your cycle, this is the week of ovulation, when the egg and sperm meet. If your egg is fertilized this month, your baby's nine-month odyssey begins as a fertilized egg whose cells multiply at a dizzying... more
Your BabyThe uterus has formed a lush bed of tissue, and the production of estrogen and progesterone increases as the uterus decides to hold onto its precious cargo -- the cluster of cells that nests inside. Some of these cells become... more
Your BabyIt's only been a week since your embryo, about the size of an apple seed, attached to the wall of your uterus, but already it has made many developmental leaps. The placenta and the umbilical cord are functioning, passing oxygen... more
Your BabyThe embryo measures a little less than one-fifth of an inch long and looks more like a tadpole than a human. The forebrain forms a hollow stalk on either side and develops small cups -- the base of each will become an eyeball.... more
Your BabyBy the end of this week, the embryo will more than double its length, growing from approximately 4 to 5 millimeters to 11 to 13 millimeters. It is now about the size of a raspberry. The head is disproportionately larger than the... more
Your BabyIf you could see your baby now, you'd be able to make out her eyelids, the tip of her nose, and her upper lip. She's approximately three-quarters of an inch long from top to bottom, and her brain, spinal cord, heart, kidneys,... more
Your BabyThe embryo may now officially be called a fetus, which literally means "little one" -- and he's about the size of a strawberry. An inch long, he has hands that can flex at the wrist, and he's able to fold them over his heart.... more
Your BabyThis week, your baby measures about 1 1/2 inches from top to bottom--about as big as a cocktail shrimp and similar in shape. Tooth buds are forming, bones are growing, and hair is starting to sprout. Her eyelids are fused shut and... more
Your BabyYour little one is roughly the size of a thumb this week, but he can swallow and kick, and his fingernails have started to grow. His head is so big it takes up almost half the length of his body, and a clear outline of his spine... more
Your BabyYou're reaching an important milestone--the end of the first trimester. Your baby now weighs about half an ounce and is about 2 1/2 inches long from top to bottom. He can open his mouth and wiggle his fingers and toes, upon which... more
Your BabyAs the second trimester begins, your baby is growing quickly. She weighs about three-quarters of an ounce and measures between 2 1/2 to 3 inches from the top of her head to her bottom. She's in her fetal period, when the organs... more
Your BabyMake a fist--that's how big your baby is now. At week 14, he weighs close to an ounce and measures between three and four inches from top to bottom. Like you, he can make a fist, too, with fingers that have a unique set of prints... more
Your BabyYour baby weighs about 1 3/4 ounces and measures between 4 1/2 inches from crown to rump. Fine, downy hair (called lanugo, which he'll shed before birth, grows on his body. Hair is sprouting on top of his head, too, although... more
Your BabyIt's the end of your fourth month, and your baby now weighs 2 1/2 ounces. She's able to kick her legs, which are measurably longer than the arms that she often swings about as she floats in a sea -- actually, 7 1/2 ounces -- of... more
Your BabyFrom crown to rump, your baby measures about 7 3/4 inches. He weighs about 5 ounces, but not for long, as fat is starting to fill out his body and keep him warm. By the time he's born, fat will account for two-thirds of his body... more
Your BabyYour baby's about eight inches long and weighs a little more than five ounces. Although she's enveloped by the familiar sound of your beating heart and rushing blood, she's conscious of noises from the outside world, too. They... more
Your BabyYour mini-gymnast weighs approximately seven ounces and measures approximately nine inches long. His arms and legs are now properly proportioned. The motor neurons between the muscles and the brain are connecting, giving him... more
Your BabyYour baby weighs in between a half to one pound this week and is 10 inches long from crown to rump. A creamy, protective coating called vernix caseosa, which is secreted by her glands, coats her skin, protecting it from the... more
Your Baby Your baby now measures about seven inches from head to rump and weighs about 10 1/2 ounces. Now that his digestive system is fairly sophisticated, your little one can swallow amniotic fluid, which makes for a surprisingly... more
Your Baby Slowly and steadily, your baby is getting bigger, topping 12 ounces this week and growing to 11 inches from crown to rump. She won't be able to flash a toothy grin until months after birth, but growth is under way now to prepare... more
Your Baby Your baby continues to put on weight, bringing him up to about a pound this week, although with his red, wrinkly, and loose skin he's far from the bonny baby he'll become. Crown to rump, he's between 11 and 12 inches long, and he... more
Your Baby Your baby is about 12 inches long and weighs a little over a pound. She has developed the sweet face you'll soon see, with eyes and ears placed just where they should be. She's big enough that she can no longer do cartwheels and... more
Your Baby This week, your baby weighs approximately 1 1/2 pounds. His heart is beating so loudly that anyone who presses an ear to your belly can hear it. His lungs are getting ready to take their first breath, and, though the sex of your... more
Your Baby For months your baby's eyes have been shut, but now they're almost fully developed and will soon be ready to open. Interestingly, whatever her ethnicity her eyes are blue at this time: The irises don't display their final color... more
Your Baby At 13 weeks from birth, your baby is now almost 14 inches from head to toe and tips the scales at a little more than two pounds. He's bulking up with fat to keep him warm after he's born, and his lungs continue to develop. His... more
Your Baby At the beginning of the third trimester, your baby measures 14 inches and weighs about 2 1/2 pounds, having doubled her weight in a month. Her brain tissue continues to develop folds and grooves on what was once a smooth surface... more
Your Baby Every day, your little one is looking more like a full-grown baby than a fetus. By the end of this week, he'll weigh about 2 3/4 pounds. For the rest of the trimester, he'll be bulking up and gaining approximately half a pound a... more
Your Baby Rock-a-bye baby, indeed--your baby goes to sleep now. When she's not asleep, she's busy making faces, bopping around, hiccuping, and nudging you. She weighs almost three pounds and is about 14 1/2 inches long. She's close to... more
Your Baby Your baby is packing on the ounces at such a clip that his weight gain outpaces the speed at which his limbs are growing. He's now almost 15 inches from head to toe. He's shedding the lanugo, and his eyebrows and eyelashes are... more
Your Baby Your normally energetic baby has started to chill out a bit. Her movements feel more like squirms and rolls rather than hyperactive kickboxing sessions. That's because this week, when she's three pounds and 15 inches long, she... more
Your Baby Your little one is about 3 1/2 pounds and is gaining as much as eight ounces a week. He continues to sprout like a reed, his arms and legs perfectly proportioned to the rest of his body. He measures between 15 and 16 inches and... more
Your Baby By the end of this week, your baby may weigh as much as four pounds and measure 16 inches. As the uterine and abdominal walls stretch and thin, more light reaches the womb, causing her to open and close her eyes in response. It... more
Your Baby Good news! There's an excellent chance that your baby will have no complications if born at 35 weeks or later. He's 5 pounds now and is nearly 18 inches. His skull is still fairly soft and isn't yet completely fused so he can... more
Your Baby Your baby weighs approximately five pounds and her full length is about 18 inches. She continues to put on fat, which will keep her warm and help her regulate her body temperature when she's born. Your Body This last month of... more
Your Baby At over 18 inches long, your baby is doing well. He's learning what it's like to breathe, inhaling and exhaling amniotic fluid to perfect his skills. He can also suck his thumb, turn his head, swallow, blink, and grasp. Your Body... more
Your Baby Congratulations -- your pregnancy has reached full-term, which basically falls anywhere between weeks 38 and 42; your due date is simply the midpoint of this time period. Soon, you'll be able to hold your baby in your arms,... more
Your Baby Your baby is in the homestretch: As he gains weight and grows to approximately 20 inches, he has very little room to maneuver. He may already be in position for delivery, his head cradled in the pelvic cavity. The brain is one of... more
Your Baby When your baby finally arrives, she'll weigh between six and nine pounds and measure about 20 inches. She'll be cute, of course, but she won't yet resemble the babies you see snuggled in their strollers. If you... more