Please choose the correct ending to complete the given sentence: Health: [header] How to hear the fetal heartbeat [title] Use a stethoscope. [step] A basic stethoscope is one of the easiest ways to listen to the fetal heartbeat at home. When you are between 18 and 20 weeks pregnant, the heartbeat should be strong enough for you to listen to with this method.

Ending1: [substeps] The stethoscope may be too heavy for you to use. If you need help adjusting, talk to your doctor. Ending2: Simply place the stethoscope on your belly and listen. You may have to move it around a bit to find the heartbeat. Ending3: A digital hand held stethoscope should be your first choice. [substeps] The advantage of a digital stethoscope is that it allows you to hear exactly what the infant is saying. Ending4: Sit down on the floor comfortably without using the stethoscope. However, if you feel tired, then use a chair or a low table in a quiet room.

Answer format: ending1/ending2/ending3/ending4