Final answer:
During the second trimester of pregnancy, the mother usually feels the first movements of the fetus, known as quickening.
Explanation:
The mother usually feels the first movements of the fetus during the second trimester, which occurs from weeks 13 to 28 of pregnancy.
Typically, by about week 20, the fetus is getting large enough for the mother to feel its movements, a process known as quickening.
During this trimester, all organs and structures of the fetus continue to develop while the placenta takes over crucial functions, such as nutrition and waste removal.
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