During the third month, Ultrasona welcomes patients to witness the miraculous development of their baby. The heart has four chambers and beats at 120 to 160 beats per minute. Eyes are almost fully developed but still remain shut. The fingers and toes are more defined and now have soft nails. Earlobes are formed. Buds which will become teeth have formed under the gums. Kidneys are developed and begin draining urine to the bladder. Most bones have begun to develop, and the umbilical cord becomes fully formed. By the end of this month, the baby will be about 4 inches long and weigh slightly over an ounce.