Sumber:

• https://www.babycentre.co.uk/a1019378/exercise-during-a-twin-pregnancy
• https://www.nhs.uk/conditions/pregnancy-and-baby/twins-healthy-multiple-pregnancy/
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5682869/
• https://www.todaysparent.com/pregnancy/being-pregnant/what-pregnancy-is-really-like-when-youre-expecting-twins/
• https://www.whattoexpect.com/pregnancy/twins-and-multiples/having-vaginal-birth-twins/
• https://www.whattoexpect.com/pregnancy/twins-and-multiples/potential-complications-carrying-twins/