How the baby's organs and senses develop, and the continuing formation of the placenta.
- The second trimester begins 12 weeks into a pregnancy.
- During the second trimester, the foetus develops basic hearing.
- The sex of a foetus can be determined after 17 weeks using ultrasound.
- By week 24, the foetus is between 28 and 35cm long and weighs just under 1kg.
After 12 weeks, the foetus enters the middle three months of pregnancy – known as the second trimester.
The foetus is now about the size of a clenched fist, and its internal organs continue to develop and grow.
The foetus begins to hear – although this is very blurred as the ...
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