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Week 4
This week marks the beginning of the embryonic period. From now until 10 weeks, all of your baby's organs will begin to develop and some will even begin to function. As a result, this is the time when she'll be most vulnerable to anything that might interfere with her
Baby Center -
week 6
The embryo has reached a size of about 8 mm (1/4 inch) in length. The spinal cord, which until now has been open, is beginning to close. The first blood cells and blood vessels are developing. Blood moves through these primitive vessels connected to the yolk sac. A pipe-shaped heart is formed and begins to beat. The brain begins to divide into 5 parts. Optic pits form the start of the developing eye. The cells destined to be the arms and legs are in place. baby2se -
week 9
The embryo has grown to measure 30 mm (1.2 inches) in length. The fingers and toes are well defined. Cartilage and bones begin to form. The upper lip as well as the nose tip is being formed. The tongue begins to develop and the larynx is developing. The eyelids are developed, although they stay closed for several months. The main construction of the heart is complete. baby2see -
week 14
This week's big developments: Your baby can now squint, frown, grimace, pee, and possibly suck his thumb! Thanks to brain impulses, his facial muscles are getting a workout as his tiny features form one expression after another. His kidneys are producing urine, which he releases into the amniotic fluid around him — a process he'll keep up until birth. He can grasp, too, and if you're having an ultrasound now, you may even catch him sucking his thumb.
babycenter -
week 17
Your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord — her lifeline to the placenta — is growing stronger and thicker. Your baby weighs 5 ounces now (about as much as a turnip), and she's around 5 inches long from head to bottom. She can move her joints, and her sweat glands are starting to develop.
babycenter -
week 20
Your baby weighs about 10 1/2 ounces now. He's also around 6 1/2 inches long from head to bottom and about 10 inches from head to heel — the length of a banana. (For the first 20 weeks, when a baby's legs are curled up against his torso and hard to measure, measurements are taken from the top of his head to his bottom — the "crown to rump" measurement. After 20 weeks, he's measured from head to toe.)
babycenter -
week 25
Your baby now weighs nearly 660g and is about 35cm long from crown to heel. He's beginning to exchange his long, lean look for some baby fat. As he does, his wrinkled skin will begin to smooth out and he'll start to look more like a newborn. His senses are becoming more sophisticated, too. At 26 weeks, fetal brain scans show response to touch. If you shine a light on your belly, your baby will turn his head, which means his optic nerve is working. http://www.babycentre.co.uk/25-weeks-pregnant#i -
week 29
Your baby now weighs a little over 1kg and measures about 39cm from head to toe. On his head, hair is growing well. If you're having a boy, his testicles will have descended from near the kidneys through the groin en route to the scrotum. If your baby is a girl, her clitoris is prominent, because it's not yet covered by the still-small labia. These will grow to cover it in the last few weeks before birth. http://www.babycentre.co.uk/29-weeks-pregnant#ixzz2KKZn8tD8 -
week 33
Your baby now weighs about 2kg and measures up to 44cm from head to toe. She may already be getting ready for birth by turning upside-down. Her head should be pointing down, ready for her journey into the world. http://www.babycentre.co.uk/33-weeks-pregnant#ixzz2KKaDHTk5 -
week 40
After months of anticipation, your due date has been and gone, and... you're still pregnant. It's frustrating, but lots of women find themselves in this situation. Rest assured your baby is quite cosy where she is. She is getting a little heavier and may grow a bit more in length. The average baby is about 51cm long from head to toe and weighs about 3.4kg at birth. But if your baby is anywhere between 2.5kg and 3.8kg, that's a healthy weight. http://www.babycentre.co.uk/40-weeks-pregnant#ixzz2
