Baby development: A baby who is one month pregnant is actually still very small. The size of the embryo is only about 2 mm, but various organs have begun to form. At this time, the embryo looks like a small snake about 1.5 cm long, with the front end of the head and the back end of the tail expanded to form a head and tail. The embryo\’s neural tube also begins to form, which will become the baby\’s brain and spinal cord. The embryo\’s heart also begins to beat, circulating blood. At this time, the baby does not have a respiratory system yet, but its cardiopulmonary and blood circulation has begun. Eyes, ears, and other organs and limbs begin to form and the surgeon can see them