The second trimester of pregnancy begins at week 13 and lasts until week This is a crucial period when most women start to feel better as morning sickness subsides, energy levels increase, and the baby's development progresses rapidly. During this time, expectant mothers may experience various changes in their body, such as weight gain, a growing belly, and increased appetite. It is important to continue regular prenatal check-ups during this trimester to monitor the health and growth of both mother and baby.