First trimester

Week 1-2 – conception takes place.

Week 3 – the baby is a tiny ball called blastocyst, made up of cells that are multiplying quickly.

Week 4 – development of the placenta.

Week 5 – signs like sore breasts and fatigue start to develop.

Week 6 – the baby’s mouth, nose, and ears start to develop. Morning sickness may set in.

Week 7-  hands and feet form.

Week 8 – the baby can constantly move though you can’t feel it.

Week 9 – the baby is almost an inch long now and much more human-like.

Week 10 – structures and organs are in place now ready to grow.

Week 11- tiny tooth buds are forming, and the hands can open and close into fists.

Week 12 – the brain is growing rapidly, and the kidneys can now excrete urine.

Week 13 – the baby is now almost 3 inches long.

Second trimester

Week 14 – less nausea 

Week 15 – the baby can now sense light. Taste buds are developing.

Week 16 – from now on the baby starts to grow more.

Week 17 – the baby’s skeleton is now changing from soft cartilage to bone.

Week 18 – the baby’s genitals are now visible on the ultrasound.

Week 19 – the baby can hear you sing!

Week 20 – the baby can swallow and produce meconium.

Week 21- 25 – more growth and movement.

Week 26 – the baby can inhale and exhale amniotic fluid in small amounts which is a good breathing practice.

Week 27 – the baby can open and close the eyes and suck the fingers.

Third trimester

Week 28 – more development of the eyes.

Week 29 – more development of the brain, lungs, and muscles.

Week 30-33 – more growth and movement.

Week 34 – lungs and the central nervous system are maturing.

Week 35- 38 – less movement due to the size, more maturity of organs. For the mother, there are occasional contractions and more vaginal discharge.

Week 39-41- the baby is full term now, and labour pains may set in any time. 

Looking to find out more you can read more about pregnancy due date calculator website for additional information about pregnancy