THIRD TRIMESTER–THE END
The seventh, eighth, and ninth months are the third and final trimester of pregnancy.
27 weeks – The foetus weighs about two pounds and is fourteen inches long. The baby’s eyes begin to open round this time.
28 weeks – The foetus has his own regular intervals for sleeping and waking. It opens and closes its eyes and may suck a thumb.
29 weeks – The baby now weighs about two and a half pounds and is about fifteen inches long. His muscles and lungs are continuing to mature, his head is growing bigger to accommodate his brain, which is busy developing billions of neurons. Baby hears and can distinguish real sounds and voices. You can now ‘teach’ your baby by playing music or simply talk to him.
30 weeks – Nourishment is transferred to the foetus from the mom’s blood, through the placenta, and the umbilical cord which is its lifeline. The foetus now weighs about three pounds.
31 weeks – Baby’s weight gain exceeds its growth in length from now on. The lungs and digestive tract are maturing. Baby may move to the rhythm of music it likes!
32 weeks – At this time the baby sleeps most of the time. The baby weighs about four pounds. The uterus is getting too small restricting the baby’s movements as there isn’t enough room. The baby’s organs are continuing to mature. Now it can also turn its head.
33 weeks – The foetus weighs four and a quarter pounds and is about eighteen inches long. The baby breaths by inhaling amniotic fluid. The baby’s hair is also growing.
34 weeks – The baby now weighs about five pounds and is approximately nineteen inches long. It may take the head-down position by this time. The skull bones are flexible and not completely joined helping to exit out of the narrow birth canal. The baby’s skin is less wrinkled and red coloured.
35 weeks – The baby is now about nineteen and a half inches long and weighs over five and a half pounds. The baby’s hearing is mature and is developing fat layers making it more round.
36-37 weeks – The baby’s weight is now about six pounds and is about twenty inches long. The baby is gradually dropping downwards. This is called lightening because of increased pressure in the lower abdomen.
38-40 weeks – The pregnancy is considered full term now. Most of the baby’s hairy skin coating has now disappeared. At birth, most babies weigh about seven and a half pounds, and are eighteen to twenty inches long, but can vary with each baby. At birth the placenta will detach from the side of the uterus and the umbilical cord will stop working as the child takes his first breaths of air outside the uterus. The child’s breathing will trigger changes in the heart that will force all blood to go through the lungs.
Week 41 and Week 42 you are considered full-term [overdue].
The ninth month is the last month of pregnancy and is the end of the third trimester.