The baby's movements at 16 weeks of pregnancy, known as quickening, begin to be felt by many expectant mothers. These movements are often described as gentle flutters or butterfly-like sensations in the lower abdomen. They can feel like tiny taps or popcorn popping inside the womb. Initially, these movements may be sporadic and subtle, occurring a few times a day. As the weeks progress, typically by the end of the second trimester, these movements become more frequent and stronger. It's important to pay attention to these movements as they provide valuable reassurance of fetal well-being. If there are concerns about the frequency or pattern of movements, or if movements are not felt by 18-20 weeks..