第 5 週：一顆微小的心臟開始跳動
你的寶寶現在大約有...大小 一顆芝麻.
平均長度: 0.2 厘米
(頭臀長)
本週寶寶發育
太神奇了！寶寶小小的心臟管已經開始跳動了！現在寶寶只有芝麻大小，但胚胎已經分化出三層。神經管（未來發育為大腦和脊髓）正飛速生長。一根原始的臍帶也在成型，連接著不斷壯大的胎盤。
本週你的身體變化
月經沒來是一個大訊號，此時體內的 hCG 水平通常足以讓驗孕棒顯示陽性了！面對喜訊感到既興奮又忐忑是正常的，有任何擔心都歡迎隨時諮詢醫生。隨著早孕反應開始，您可能會覺得身體像「感冒」了一樣不太對勁。
給伴侶的貼士
現在是官方認證的「準爸爸」了，快給她滿滿的關懷吧！陪她去第一次產檢。對了，醫生建議孕婦要遠離貓砂以防弓形蟲感染，這可是您表現的好機會，幫她承包這個家務吧。
References
[1]
Fetal Development: Week-by-Week Stages of Pregnancy - Cleveland Clinichttps://my.clevelandclinic.org/health/articles/7247-fetal-development-stages-of-growth
[2]
Fetal development: The first trimester - Mayo Clinichttps://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/prenatal-care/art-20045302#:~:text=The%20embryo%20is%20now%20made,lungs%20and%20intestines%20will%20develop
[3]
The umbilical cord: a rich and ethical stem cell source to advance regenerative medicine - NIHhttps://pmc.ncbi.nlm.nih.gov/articles/PMC6495455/#:~:text=From%20the%20third%20week%20of,shape%20of%20an%20umbilical%20ring
[4]
5 Weeks Pregnant: Baby Development, Symptoms & Signs - What To Expecthttps://www.whattoexpect.com/pregnancy/week-by-week/week-5.aspx#:~:text=It's%20time%20to%20pee%20on,by%20a%20home%20pregnancy%20test
[5]
Week 5 Pregnancy: Your Baby's Heart Starts To Beat - Thomson Medicalhttps://www.thomsonmedical.com/blog/week-5-pregnancy
[6]
Mayo Clinic Minute: Pregnancy and toxoplasmosis - Mayo Clinichttps://newsnetwork.mayoclinic.org/discussion/mayo-clinic-minute-pregnancy-and-toxoplasmosis/