First Trimester

Pregnancy Week 13

How big is yourbaby? Your baby now measures 7.4cm (2.91 inches) and weighs about 23 grams (0.81 ounce).It is about the size of a peach. Your baby's development One striking change in your baby's growth is the slowdown of the developmentof his/her head in comparison to the rest of the body. At this stage the head isstill about half the length of the crown to rump measurement, but by the time youare in your 21st week this will have changed to about a third of the crown to rumpmeasurement. Your baby's face is also starting to look more human like.…


Pregnancy Week 12

How big is your baby? Your baby is now measuring about 5.4cm, which is 2.13 inches and weighs about 14grams, which is about 0.49 ounce. Your baby's development Few Few new structures are formed during the course of this week but those thatare already forming will continue to grow and develop.   At your 12 week check up you may be able to hear the sound of your baby's heartbeating with the aid of a doppler, which is a special listening device. It magnifiesyour baby's heart beat so that you and your partner can hear it. If you dont hearthe…

Pregnancy Week 11

How big is your baby? By the end of this week your baby's crown to rump measurement will be 4.1cm (1.61inch)and should be weighing about 7 grams, which is 0.25 ounce. At the moment your babyis about the size of a large lime.   Your baby's development Week 11During the next 3 weeks your baby willdouble in length. Your babys external genitalia are beginning to show distinguishing features now,however development into either male or female will only be complete in the next3 weeks. You can view a video on genitalia formation in our pregnancy media section. Babys eyes are still…

Pregnancy Week 10

How big is yourbaby? By the end of this week your baby will measure around 3.1cm (1.22inch) and weighsaround 4grams (0.14ounce). growth over this week is going to be rapid. Your baby's development The end of week 10 sees the end of the embryonic period and the start ofthe fetal period. By now your baby's head will make up more than half of his/her total length. Yourbaby's body will continue to straighten and grow as this week goes by. Your babyshead now also appears to be more rounded. Over the next few days hair follicles, finger nails and toe nails…

Pregnancy Week 9

How big is your baby? Your baby now measures 2.3cm (0.90inch) and weighs around 2grams (0.7ounces). Itis now about the size of a medium green olive. By the end of the week your babysarms will only be about as long as this 1   Your baby's development Week 9There have been many changes to yourgrowing baby over the last few days. Your baby's arms and legs are now longer andstraighter. His/her hands will be flexed at the wrist and will almost meetover the heart. Your baby will have longer fingers now which are enlarged at the ends - as the…

Pregnancy Week 8

How big is your baby? By the end of the 8th week your baby will measure between 1.6cm (0.63inch) and weigharound 1gram (0.04ounce). Your baby would fit into a wallnut shell and will weightaround the same as a book of matches by the end of the week. Your baby's development Your baby is continuing to grow and develop at a very fast pace. By now yourbaby has eyelid folds, nerve cells and the retina are also beginning to form inthe eye. Your baby should now have a tip to his/her nose and even the ears are developing,both internally and externally.…

Pregnancy Week 7

How big is your baby? Your baby will be going through a big growth spurt this week. At the beginning ofthis week the crown to rump measurement is between 0.16-0.2 inches, or 4-5mm, andby the time this week is completed your baby will measure 1/2 inch, or 1.1-1.3cm(11-13mm)! At the end of this week your baby will weigh about as much as an eyelash. Your baby's development Leg and arm buds are now beginning to show, which have been developing sincethe 6th week. Although the arm buds are developing, they have not even divided intohand and arm segments yet. Using…

Pregnancy Week 6

How big is your baby? The crown to rump length of your baby now measures around 0.08-016 inches, whichis 2-4mm. The crown to rump is the distance from the top your baby's head to it'srump. Your baby's development Your babys heart should start beating this week and with the proper equipment,such as an ultrasound,you may be able to see your baby's heart beating. Initial circulation starts offin the mesoderm, yolk sac and the linning of the placenta. By the middle of this week the aorta will have started to formin your babys heart. Another major development this week is that…

Pregnancy Week 5

How big is your baby? Your baby hasn't grown a great deal in size since last week and will now measure about 0.05 inches, which is about 1.25mm. This however does not mean that your baby is not changing and developing. There is in fact lots of development which is taking place. At this stage, the amniotic sac is about the size of a grape. Your baby's development During this week a plate, which will later become your babys heart, will start to develop as well as the central nervous system, muscles and bone formation will also begin to take…

Pregnancy Week 4

How big is your baby? At this stage of your pregnancy your baby is already 2 weeks old and measuring about0.04 inches or about 1mm in length. Your baby's development Although fetal development is still in the early stages there is still plenty ofchanges taking place. By this stage of your pregnancy the blastocyst would have embedded itself into thewall of your uterus even deeper and the amniotic cavity, which will later be filledwith amniotic fluid, will already have started to form. The germ layers, which are different layers of cells, will have begun to form. Theselayers will later form…