 Well, in this module, we will be studying the prenatal development kahaisa hai, lakin second trimester. Or second trimester, you have from month four to six after pregnancy. Well, the second trimester is the fourth to sixth month of pregnancy. Now, fetal growth is spectacular. Now by now, the pregnant mother is aware of fetal movement. But fetus, it starts moving or movement. It can be experienced by the mother. Or the heartbeat that can be heard with the stethoscope. And it is very important to check up its continuous. So that you can know from the heartbeat that the fetus is living. It has no problem. If the heartbeat is very fast in this period, but the gynecologist knows how much heartbeat it has. And if it slows, that indicates that there is something, some problem in the process of growth. Now, during the sixth month, the upper and lower eyelids, they separate and eyelashes, they start appearing. Now, during this period, the bones, they begin to ossify. And the ossification starts. It starts with calcium deposits. Because in the first trimester, all these structures are of some kind of cartilaginous. After that, the ossification begins during this period. And due to this, the bone formation starts. But if these bones are not that strong, but they are flexible, but the ossification and calcification starts during this period. And in the second trimester, the baby comes in this form. The head, the limbs are also visible. And this is covered by membrane, which is said to be the amniion. This amniotic fluid is in this amniion. So, this is an aquatic environment for this baby at this time. Because if this amniotic fluid decreases in some form, then it becomes problematic. Well, during the final weeks of second trimester, major organs such as the liver and pancreas, they become also clear. Now, by the end of six months of pregnancy, the fetus is about 10 to 11 inches long and weighs about 1 pound. Now, during the final trimester, the growth becomes very fast. Or, externally, one can see the signs of pregnancy. So, this is all about the second trimester in the human, that is babies. So, this is all about.