The baby's growth and development, and the changes taking place in the mother's body in the final months of pregnancy.
- The third trimester of a pregnancy begins around week 26, and ends with the birth of the baby.
- During the first six weeks of the third trimester, a foetus more than doubles in size.
- The growth of the foetus brings about changes in the mother's body.
- At 37 weeks, the foetus is considered strong enough to support itself without the mother.