The diameter of a 44-day gestational sac is about 1.6 centimeters. Generally speaking, the 44-day gestational sac is relatively small and does not have a standard value, the approximate value is about 1.6 centimeters, and there are some fetuses that develop later or women ovulate later, which may lead to a smaller diameter of the gestational sac, which is also relatively normal. It is not necessary to pay too much attention to the size of the gestational sac during pregnancy, as the fetus will gradually increase in size over time, as long as the fetus develops normally. If the fetus is significantly smaller or larger during pregnancy, it is recommended to consult a doctor. Normally, you need to eat more nutritious food and exercise appropriately to strengthen the body’s resistance and promote the development of the fetus.