The short answer
Most women first feel movements between about 16 and 22 weeks. In a second or later pregnancy you may notice them earlier, around 16 weeks; in a first pregnancy often closer to 20 weeks. Early movements feel like fluttering or bubbles. Movements become clear and regular in the sixth month.
Later in pregnancy, report any noticeable reduction in movements to your obstetrician promptly. See pregnancy week by week.
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Answered by Dami Women's Clinic (다미산부인과의원), Yeouido, Seoul · Dr. Ko Sang-hyun, OB/GYN. General information, not a diagnosis. Emergencies in Korea: call 119. Medical disclaimer · International Patient Center