Medela輔助喂奶的，這兩個哪個好？ 請大家給個意見，謝謝

還有一個月就生了。這兩個的區別是單管和雙管的區別麽？謝謝

http://www.amazon.com/Medela-00901S-Supplemental-Nursing-System/dp/B002Y2NFBI/ref=sr_1_4?s=baby-products&ie=UTF8&qid=1351531333&sr=1-4&keywords=medela+Supplemental+Nursing+System%E2%84%A2+%28SNS

 

http://www.amazon.com/Starter-Supplemental-Nursing-System-Bottle/dp/B001G87KYE/ref=sr_1_2?s=baby-products&ie=UTF8&qid=1351531333&sr=1-2&keywords=medela+Supplemental+Nursing+System%E2%84%A2+%28SNS