1. Fetal size in three months of pregnancy At three months of pregnancy, the fetus has grown to about 5 cm in length and weighs about 14 grams. At this time, the fetus\’s head is larger than its body and takes up most of the volume. The fetus\’s facial features also begin to form, including eyes, ears, nose, and mouth. 2. Development of Fetal Organs in Three Months of Pregnancy At three months of pregnancy, the fetal organs have begun to form and gradually develop and improve. At this time, the heart has been divided into four chambers and begins to beat; the liver and kidneys also begin to function; digestion also begins to take shape,