第4周：使命重大的罂粟籽
宝宝现在的大小，相当于 一颗罂粟籽.
平均长度: 0.2 厘米
（头到臀）
宝宝的发育情况
宝宝现在已经是一个胚胎了，像一颗罂粟籽那么大，并已经在您的子宫里“安家落户”啦！一个充满液体的羊膜囊正在形成，为它提供温柔的保护。胎盘也开始马不停蹄地建设，很快就会为宝宝输送氧气和养分。
妈妈的身体变化
您可能会感到类似经期前的胀气或乳房胀痛，有些准妈妈还会出现少量的“着床出血”。不过，完全没感觉也是正常的！虽然有些试纸宣称可以提早检测，但建议等到月经推迟的第一天再测，结果最准确哦。
给伴侣的小贴士
如果测出了两道杠，快和她一起庆祝这个喜讯吧！她的身体正在为了孕育生命而加班加点，可能会感到非常疲惫。主动分担一些家务就是对她最好的支持。您的爱是她最坚强的后盾。
References
[1]
Fetal development: The first trimester - Mayo Clinichttps://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/prenatal-care/art-20045302
[2]
Stages of Fetal Development - Women's Health Issues - Merck Manualshttps://www.merckmanuals.com/home/women-s-health-issues/normal-pregnancy/stages-of-fetal-development
[3]
Fetal development week by week - BabyCenterhttps://www.babycenter.com/pregnancy/your-baby/fetal-development-week-by-week_10406730
[4]
4 weeks pregnant guide - Best Start in Life - NHShttps://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/1st-trimester/week-4/
[5]
12 Early Signs of Pregnancy - SSMHealthhttps://www.ssmhealth.com/newsroom/blogs/ssm-health-matters/april-2022/12-early-signs-of-pregnancy
[6]
14 Ways Partners Can Help in Pregnancy, Birth, & Postpartum - Milestones Pediatric & Maternal Nutritionhttps://www.milestonesnutrition.com/blog/partnersupport
[7]
What your partner might need from you during pregnancy - Allina Healthhttps://www.allinahealth.org/health-conditions-and-treatments/health-library/patient-education/beginnings/for-dads-and-partners/your-partner/what-your-partner-might-need-from-you-during-pregnancy