Source: http://www.fitpregnancy.com/
Week 13
Your baby is 2 1/2 to 3 inches long, the size of a medium goldfish. She weighs about one ounce. Your baby is shorter than a finger, but her face is already showing individual features and characteristics! Her ears are now developed enough that she may be able to hear when you sing, hum, or talk. And her vocal cords will form this week—soon she'll be able to sing back. Your baby spends her time in your womb flexing her new and developing muscles and joints. Bouts of prenatal hiccups are strengthening your baby's diaphragm, which is preparing her respiratory system for breathing. Less glamorous but highly necessary organ systems for making hormones, absorbing nutrients, and filtering waste are also in place this week. The pancreas, gall bladder, and thyroid have developed, the kidneys can make urine, and her bone marrow is making white blood cells to help fight infection after she's born.
Week 14
By weeks 14-17, your baby's bone marrow is producing blood cells; his liver is secreting bile; his pancreas is producing insulin; and he will be covered in a layer of downy hair called lanugo. Around week 16, you may get your first ultrasound, but don't count on learning your baby's sex quite yet. Between weeks 14 and 18, you can opt to have a Quad Screen or amniocentesis, tests that can detect a neural-tube defect, such as spina bifida, Down syndrome or other genetic disorders. Discuss these tests with your doctor to help you decide.
Week 15
Your baby is about 4 to 4 1/2 inches and about 1 3/4 of an ounce. If you could see your baby's face, you might be able to see her wince and grimace, because her facial muscles are developing and flexing. All of her tiny organs, nerves, and muscles are starting to function. The intestines have moved farther into the baby's body; her liver begins to secrete bile, which will later aid in the digestion of fats; and her pancreas begins to produce insulin, a hormone which turns sugar into energy.
Week 16
Your baby weighs about 2.8 ounces (79 grams) and is about 4 1/2 inches from crown to rump—roughly the size of a small gerbil. At any time, you will begin to feel fetal movement as your baby's bones harden, and she starts a big growth spurt. Your baby has plenty of room: At this point, she could fit in the palm of your hand. This is a great time to be a fetus. At any given time, she might be playing with the umbilical cord (which she's now able to grasp), putting her thumb in her mouth, or kicking at the amniotic sac.
Week 17
Your baby is about as wide as your palm, about six inches tall, and weighs about four ounces—about as much as a bar of soap. She now weighs more than your placenta. Your baby is now covered with a downy layer of lanugo, which swirls in fingerprint-like formation over her whole body. Her skin is still thin. Brown fat, a special type of fat that plays a role in body heat generation, is being deposited. In the next few weeks, your baby's eyes will begin to move beneath their fused lids in a side-to-side sweeping motion.
Week 18
Your baby is about 5 to 5 1/2 inches long from top to tail and weighs a little more than five ounces, about the size of a lobster tail. While in earlier weeks, your baby may have been able to sense sound with her primitive ear structures, this week, the bones of the ear become fully formed along with the part of her brain that processes signals from his ears. There's still plenty of room in your uterus, so your fetus can be quite active with her new muscles. She may change positions frequently, cross her legs, recline, suck her thumb, and turn somersaults. Her retinas have become light sensitive, and your baby may be able to detect a glow if you shine bright lights at your belly (even though her eyelids are sealed).
Week 19
Your baby is between five and six inches long and weighs about seven ounces—about the size of an apple. If the baby is a girl, early ovaries contain follicles with forming eggs. Soon, half of the genetic material for your potential future grandchildren will be formed. Pictures of babies at this age show them touching the membrane of the amniotic sac, touching their own faces, reaching for the umbilical cord, pedaling their legs, and sucking their thumbs. If you're carrying twins, they may already be swatting at each other. Your baby may already have a preference for the left or right hand. In the brain, areas of the nerve cells that serve the senses of touch, taste, smell, sight, and hearing are becoming specialized and are forming more complex connections. Loud sounds as well as any feelings you may have of stress or alarm may be communicated to the baby. The baby responds to these stresses by becoming more active. Practicing yoga and meditation can be good for your sense of calm and balance.
Week 20
By week 20, your baby begins to produce vernix, a white, creamy substance that protects his skin in his watery environment. Permanent teeth are starting to form behind his baby teeth. He seems able to differentiate between morning, afternoon and evening and starts to become more active at certain times than at others.
Week 21
By week 21, your baby weighs about 10 1/2 ounces, and her length from head to rump is seven inches, about the length of a spoon. Ten and one-half ounces is also the size bear cubs are when they are born. Your baby has begun her main project for the rest of your pregnancy: putting on weight. She regularly drinks amniotic fluid for hydration and nutrition, urinates in the fluid and breathes in and out (fortunately, the fluid pool refreshes itself every three hours). Her eyebrows and eyelids are fully developed. Taste buds are forming on her tongue. Her eyelids are still sealed, but her eyes are active.
Week 22
Your baby is about 7 1/2 inches from crown to rump and weighs between thirteen and sixteen ounces—about the size of a small grapefruit. She is entering her fifth month of existence. Her fingernails are almost fully grown, and her organ systems are becoming more functional and specialized. She has a distinct pair of lips, and her first canines and molars are developing below her gum line. She looks like a miniature newborn. Blood is traveling through the umbilical cord at four miles an hour, fueling her growth with oxygen and nutrients.
Week 23
Weighing in at a pound, and at eight inches long, your baby is starting to really look like a baby! You can compare her size to a box of sugar or a bag of coffee beans. Her skin is filling out as the first layers of fat are deposited and her muscles grow. During the next month, her weight may almost double.
Week 24
Your baby weighs a little over a pound and is about 8 1/2 inches long—the size of a banana. Your baby's skin becomes less translucent as pigment is deposited, and it looks wrinkly because her body is making her skin more quickly than it makes the fat to pad underneath it. Your baby's unique hand- and footprints are forming. You may feel jumps as she has bouts of hiccups. In fact, it may seem like the baby is in perpetual motion. Some babies now kick in response to sounds and touch from outside the womb. Encourage your partner to talk to the baby, and see if she kicks in response!
Week 13
Your baby is 2 1/2 to 3 inches long, the size of a medium goldfish. She weighs about one ounce. Your baby is shorter than a finger, but her face is already showing individual features and characteristics! Her ears are now developed enough that she may be able to hear when you sing, hum, or talk. And her vocal cords will form this week—soon she'll be able to sing back. Your baby spends her time in your womb flexing her new and developing muscles and joints. Bouts of prenatal hiccups are strengthening your baby's diaphragm, which is preparing her respiratory system for breathing. Less glamorous but highly necessary organ systems for making hormones, absorbing nutrients, and filtering waste are also in place this week. The pancreas, gall bladder, and thyroid have developed, the kidneys can make urine, and her bone marrow is making white blood cells to help fight infection after she's born.
Week 14
By weeks 14-17, your baby's bone marrow is producing blood cells; his liver is secreting bile; his pancreas is producing insulin; and he will be covered in a layer of downy hair called lanugo. Around week 16, you may get your first ultrasound, but don't count on learning your baby's sex quite yet. Between weeks 14 and 18, you can opt to have a Quad Screen or amniocentesis, tests that can detect a neural-tube defect, such as spina bifida, Down syndrome or other genetic disorders. Discuss these tests with your doctor to help you decide.
Week 15
Your baby is about 4 to 4 1/2 inches and about 1 3/4 of an ounce. If you could see your baby's face, you might be able to see her wince and grimace, because her facial muscles are developing and flexing. All of her tiny organs, nerves, and muscles are starting to function. The intestines have moved farther into the baby's body; her liver begins to secrete bile, which will later aid in the digestion of fats; and her pancreas begins to produce insulin, a hormone which turns sugar into energy.
Week 16
Your baby weighs about 2.8 ounces (79 grams) and is about 4 1/2 inches from crown to rump—roughly the size of a small gerbil. At any time, you will begin to feel fetal movement as your baby's bones harden, and she starts a big growth spurt. Your baby has plenty of room: At this point, she could fit in the palm of your hand. This is a great time to be a fetus. At any given time, she might be playing with the umbilical cord (which she's now able to grasp), putting her thumb in her mouth, or kicking at the amniotic sac.
Week 17
Your baby is about as wide as your palm, about six inches tall, and weighs about four ounces—about as much as a bar of soap. She now weighs more than your placenta. Your baby is now covered with a downy layer of lanugo, which swirls in fingerprint-like formation over her whole body. Her skin is still thin. Brown fat, a special type of fat that plays a role in body heat generation, is being deposited. In the next few weeks, your baby's eyes will begin to move beneath their fused lids in a side-to-side sweeping motion.
Week 18
Your baby is about 5 to 5 1/2 inches long from top to tail and weighs a little more than five ounces, about the size of a lobster tail. While in earlier weeks, your baby may have been able to sense sound with her primitive ear structures, this week, the bones of the ear become fully formed along with the part of her brain that processes signals from his ears. There's still plenty of room in your uterus, so your fetus can be quite active with her new muscles. She may change positions frequently, cross her legs, recline, suck her thumb, and turn somersaults. Her retinas have become light sensitive, and your baby may be able to detect a glow if you shine bright lights at your belly (even though her eyelids are sealed).
Week 19
Your baby is between five and six inches long and weighs about seven ounces—about the size of an apple. If the baby is a girl, early ovaries contain follicles with forming eggs. Soon, half of the genetic material for your potential future grandchildren will be formed. Pictures of babies at this age show them touching the membrane of the amniotic sac, touching their own faces, reaching for the umbilical cord, pedaling their legs, and sucking their thumbs. If you're carrying twins, they may already be swatting at each other. Your baby may already have a preference for the left or right hand. In the brain, areas of the nerve cells that serve the senses of touch, taste, smell, sight, and hearing are becoming specialized and are forming more complex connections. Loud sounds as well as any feelings you may have of stress or alarm may be communicated to the baby. The baby responds to these stresses by becoming more active. Practicing yoga and meditation can be good for your sense of calm and balance.
Week 20
By week 20, your baby begins to produce vernix, a white, creamy substance that protects his skin in his watery environment. Permanent teeth are starting to form behind his baby teeth. He seems able to differentiate between morning, afternoon and evening and starts to become more active at certain times than at others.
Week 21
By week 21, your baby weighs about 10 1/2 ounces, and her length from head to rump is seven inches, about the length of a spoon. Ten and one-half ounces is also the size bear cubs are when they are born. Your baby has begun her main project for the rest of your pregnancy: putting on weight. She regularly drinks amniotic fluid for hydration and nutrition, urinates in the fluid and breathes in and out (fortunately, the fluid pool refreshes itself every three hours). Her eyebrows and eyelids are fully developed. Taste buds are forming on her tongue. Her eyelids are still sealed, but her eyes are active.
Week 22
Your baby is about 7 1/2 inches from crown to rump and weighs between thirteen and sixteen ounces—about the size of a small grapefruit. She is entering her fifth month of existence. Her fingernails are almost fully grown, and her organ systems are becoming more functional and specialized. She has a distinct pair of lips, and her first canines and molars are developing below her gum line. She looks like a miniature newborn. Blood is traveling through the umbilical cord at four miles an hour, fueling her growth with oxygen and nutrients.
Week 23
Weighing in at a pound, and at eight inches long, your baby is starting to really look like a baby! You can compare her size to a box of sugar or a bag of coffee beans. Her skin is filling out as the first layers of fat are deposited and her muscles grow. During the next month, her weight may almost double.
Week 24
Your baby weighs a little over a pound and is about 8 1/2 inches long—the size of a banana. Your baby's skin becomes less translucent as pigment is deposited, and it looks wrinkly because her body is making her skin more quickly than it makes the fat to pad underneath it. Your baby's unique hand- and footprints are forming. You may feel jumps as she has bouts of hiccups. In fact, it may seem like the baby is in perpetual motion. Some babies now kick in response to sounds and touch from outside the womb. Encourage your partner to talk to the baby, and see if she kicks in response!
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