Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to conceive twins [title] Recognize that only about 3% of births result in multiple babies. [step] Twins are not the norm when it comes to childbirth. While some things raise your chances of having twins (or other multiples, like triplets) slightly, it's a good idea to expect just 1 baby and be pleasantly surprised if you end with 2 or more.

Ending1: [title] Consider whether you are trying to conceive twins. [step] If you believe you have a twin, you may want to try caring for one baby after the other. Ending2: [substeps] Twins account for about 95% of multiple births. [title] Check if the mother's family tree includes a history of twins. Ending3: If things make you pregnant by mistake, ask your doctor what she or he thinks you should try doing right away. [substeps] Babies usually kick in 20 to 30 days after birth. Ending4: This is a big plus for most birth attendants. [title] Know that conception is still a labor.

Answer format: ending1/ending2/ending3/ending4