Pregnancy should technically start from the first day of your last period. However, as the exact day of ovulation and conception is truly tricky to pinpoint, in the medical world, being 1 week pregnant simply means you’re on your period and are not pregnant just as yet.

If you think you're 2 weeks pregnant, you might not actually be. Even so, the pregnancy symptoms might not be obvious to you.

You might be experiencing some early signs of pregnancy symptoms, but it is minor as compared to what will be coming when your hormones fluctuate.

Length of baby: 0.2cm (2mm)
Do start taking folic acid supplements, because folic acid has been proven to help prevent birth defects.

Length of baby: 0.33cm (3.3mm)
At about 0.33cm, your baby, though small, is already starting to form major organs like it’s heart, liver, kidney and stomach.

Length of baby: 0.64cm (6.4mm)
At week 6, your baby‘s nose, mouth, chin, cheek and ears are already beginning to take shape.

Length of baby: 1.3cm (13mm)
At week 7, the embryo is generating six thousand brain cells per hour, and the baby's hands and feet are growing nicely though at this stage it looks like paddles.

Length of baby: 1.6cm (16mm)
Weight of baby: 1.13g
At week 8, your baby’s eyelids now cover it’s eyes, and breathing tubes extend to the developing lungs, while it's tail is now gone.

Length of baby: 2.3cm (23mm)
Weight of baby: 2g (0.02kg)
At week 9, your baby is now officially a foetus and no longer an embryo. This means major organs including the heart, brain, lungs, arms and legs are now formed and developing.

Length of baby: 3.2cm (32mm)
Weight of baby: 4g (0.004kg)
At week 10, your baby now has a large forehead which measures about half the length of it's body. This is due to the brain that is rapidly developing.

Length of baby: 4cm (40mm)
Weight of baby: 7g (0.007kg)
At week 11, your baby's head is the same size as the rest of it's body at a ratio of 1:1.

Length of baby: 5.3cm (53mm)
Weight of baby: 14g (0.014kg)
At week 12, your baby is developing reflexes and it's face is starting to look human.

Length of baby: 7.4cm (74mm)
Weight of baby: 23g (0.023kg)
At week 13, your baby's body is growing faster than the head and the head is now about one third of its entire height.

Length of baby: 8.9cm (89mm)
Weight of baby: 42g (0.042kg)
At week 14, your baby's kidneys are producing urine and it is starting to pee into the amniotic fluid it is surrounded by.

Length of baby: 10cm (100mm)
Weight of baby: 72g (0.072kg)
At week 15, your baby is able to move all it's limbs and joints.

Length of baby: 11.4cm (114mm)
Weight of baby: 100g (0.1kg)
At week 16, you might feel your baby kicking for the first time!

Length of baby: 13cm (130mm)
Weight of baby: 150g (0.15kg)
At week 17, your baby’s soft skeleton is changing from cartilage to bone, and the umbilical cord, which is the lifeline to the placenta, is also now growing stronger and thicker.

Length of baby: 14m (140mm)
Weight of baby: 200g (0.2kg)
At week 18, your baby is flexing it's arms and legs and this is where you will feel the “kicks” on your belly.

Length of baby: 15cm (150mm)
Weight of baby: 240g (0.24kg)
At week 19, your baby is developing the five senses - smell, taste, touch, sound and sight – for use when out of the womb.

Length of baby: 16.5cm (165mm)
Weight of baby: 300g (0.3kg)
At week 20, your baby's internal organs such as the lungs and digestive system are developing and the bones are also getting stronger each day.

Length of baby: 26cm (260mm)
Weight of baby: 350g (0.35kg)
At week 21, if your child is a boy, the testes are still located in the abdomen but will drop in the upcoming weeks once the scrotum finishes developing. If your child is a girl, her vagina has begun to form and she already has about six million eggs in her womb.

Length of baby: 27cm (270mm)
Weight of baby: 430g (0.43kg)
At week 22, your baby is getting into the whole sleep cycle - about 12 to 14 hours per day.

Length of baby: 29cm (290mm)
Weight of baby: 500g (0.5kg)
At week 23, you will see during your ultrasound that your baby has a fully formed fetus face.

Length of baby: 30cm (300mm)
Weight of baby: 600g (0.60kg)
At week 24, your baby has skin that is now more opaque, taking on a pinkish hue due to the newly formed capillaries.

Length of baby: 34.2cm
Weight of baby: 680g (0.68kg)
At week 25, your baby is improving it's dexterity in the hands and fingers, which means it will be able to open and close the hands and even grab hold of the umbilical cord.

Length of baby: 35.5cm
Weight of baby: 770g (0.77kg)
At week 26, your baby’s eyes are now beginning to open, and the little one’s ears are now developed to an extent that it is now able to hear voices.

Length of baby: 37cm
Weight of baby: 900g (0.90kg)
At week 27, your baby's brain is starting to show brain activity, and will continue to develop in complexity in the weeks ahead.

Length of baby: 37.6cm
Weight of baby: 1000g (1kg)
At week 28, the little one’s lungs are now mature enough that in the event of a premature birth, it would probably survive.

Length of baby: 38.6cm
Weight of baby: 1.14kg
At week 29, your baby's brain is developed such that it is already able to control body temperature and rhythmic breathing. It is also speculated that your baby can even dream at this point!

Length of baby: 40cm
Weight of baby: 1.32kg
At week 30, your baby’s sleep patterns show signs of rapid eye movement, which is the dreaming stage of sleep, so this means your baby is now having weird dreams!

Length of baby: 41.2cm
Weight of baby: 1.5kg
At week 31, your baby's brain is going through a rapid development phase and all five sense are now working.

Length of baby: 42.5cm
Weight of baby: 1.66kg
At week 32, your baby will go onto a weight gain surge, gaining about ⅓ to ½ of the total birth weight from now till birth to fatten up for life outside the womb.

Length of baby: 43.5cm
Weight of baby: 1.9kg
At week 33, your baby's bones are hardening, but the skull is not yet fused together (the skull can move and overlap) which enables the baby to pass through the birth canal easily.

Length of baby: 45.4cm
Weight of baby: 2.15kg
At week 34, your baby's nervous system is maturing, and the the lungs is now becoming well developed ready for the first breath of air.

Length of baby: 46.3cm
Weight of baby: 2.4kg
At week 35, your baby's basic physical development is now more or less complete, and all that is left would be to put on more weight as it readies for birth.

Length of baby: 47.2cm
Weight of baby: 2.7kg
At week 36, your baby is shedding the covering of hair and protective layer that protected it's skin from the amniotic fluid. Your baby will swallow both substances, and it will form the contents of the first bowel movement.

Length of baby: 48cm
Weight of baby: 2.8kg
At week 37, your baby is almost ready to meet the world, and is now practising sucking, gripping, blinking, inhaling and exhaling.

Length of baby: 49.5cm
Weight of baby: 3.08kg
At week 38, most of your baby’s organs have matured (except the brain and lungs, which are still developing this week) and your baby is now a little fully functional human ready for the outside world.

Length of baby: 50.8cm
Weight of baby: 3.25kg
At week 39, your baby's nervous system is well developed, meaning the little one can suck, swallow and stay awake long enough to eat, which isn’t always the case for babies born earlier.

Length of baby: 51.3cm
Weight of baby: 3.4kg
At week 40, your baby is ready to come out to meet the world!

Length of baby: 51.8cm
Weight of baby: 3.6kg
At week 41, because your baby is spending extra time in the womb, it will be heavier and more alert when it is born.

Length of baby: 51.9cm
Weight of baby: 3.7kg
At week 42, your placenta will start to become less efficient at supplying your baby with oxygen and all the nutrients it needs. This is why at week 42, you will be monitored regularly when you’re overdue.