1. Development of the baby at 16 weeks of pregnancy. At 16 weeks of pregnancy, the fetus has grown to about 11 centimeters in length and weighs about 100 grams. At this time, the baby\’s body proportions have become normal, and the proportion of the head relative to the body has gradually decreased. In addition, your baby\’s lungs begin to secrete fluid in preparation for birth. 2. Things you need to pay attention to during 16 weeks of pregnancy 1. Diet: You should pay attention to balanced nutrition and eat more foods rich in protein, calcium and iron. 2. Exercise: Appropriate exercise is beneficial to the fetus