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Second trimester of pregnancy - 25 to 28 weeks

Week 25 of pregnancy

Your unborn baby is moving about and responds to touch and sound. A very loud noise may make them jump and kick. You will be able to feel this. This is called the 'startle response'. They may respond to your voice with movement. Talk and sing to them and encourage your partner to do the same.

At this stage, your unborn baby is passing urine into the amniotic fluid. Sometimes they may get hiccups and you can feel the jerk of each hiccup. Their eyelids open for the first time and they will soon start blinking. It is not until some weeks after the birth that your baby's eyes become the colour they will stay.

By now your unborn baby's heart rate will have slowed to around 140 beats per minute. This is still much faster than your own heart rate.

Related topic

Your baby’s movements during pregnancy

Week 26 of pregnancy

At 26 weeks your unborn baby is around 36cm long. This is like the length of a scallion. Their lungs are producing an important substance called surfactant. This is essential. It allows the air sacs of their lungs to expand and deflate during breathing.

Their brain, lungs and digestive system are in place. But they are still developing.

Week 27 to 28 of pregnancy

Week 27 marks the last week of the second trimester. Your unborn baby weighs around 1kg. You can hear their heartbeat through a stethoscope. They continue to put on weight, as more and more fat appears under the skin. This makes their skin appear smoother and less wrinkled. Week 28 marks the start of the third trimester.

Related topic

29-32 weeks pregnant

page last reviewed: 14/11/2018
next review due: 14/11/2021