การเจริญของเอ็มบริโอสามารถดูได้จากค่าที่จากการวัดออกมาเป็นมิลลิเมตร วิธีการวัดมีหลายวิธี

     3.1 ระยะที่เอ็มบริโอรูปทรงกระบอก ( 3 – 4 สัปดาห์แรก) วัดจากปลายข้างหนึ่งไปยังปลายอีกข้างหนึ่ง เรียกว่า greatest length (GL)

3.2   ระยะที่เอ็มบริโอตัวงอคล้าย C วัดจากศีรษะถึงก้นเรียวกว่า crown – rump length (CR) นิยมใช้วัดมากที่สุด

 
 

3.3  ระยะเอ็มบริโอคล้ายคน (8 สัปดาห์) วัดจากศีรษะถึงส้นเท้าเรียก crown – heel length (CH) ทางการแพทย์จะแบ่งการตั้งครรภ์ออกเป็น 3 trimester แต่ละ trimester กินเวลา 3 เดือน ช่วง trimester แรกเอ็มบริโอจะมีอวัยวะครบแล้วสามารถแยกเพศได้ มีพัฒนาการของอวัยวะ เคลื่อนไหวและหายใจได้ เกิด reflex แบบง่ายๆ notochord หายไปเกิดกระดูกสันหลังขึ้นมาแทน trimester แรกนี้เป็นช่วง critical period เพราะช่วงนี้มีความเสี่ยงต่อสารที่ทำให้เกิดความผิดปกติได้สูง เนื่องจากมีการแบ่งและเปลี่ยนแปลงของเซลล์ตลอดเวลา ปัจจัยที่ทำให้เกิดการเจริญผิดปกติอาจมาจากพันธุกรรมหรือสิ่งแวดล้อมก็ได้ ในช่วง trimester ที่ 2 สามารถฟังเสียงเต้นของหัวใจได้โดยใช้หูฟัง (stethoscope) ส่วนใน trimester สุดท้าย fetus จะเจริญเร็วมาก
 

การนับอายุทารกในครรภ์ อาจนับตาม menstruation age (last normal menstruation period หรือ LPMP) คือ นับจากวันแรกของการมีประจำเดือนครั้งสุดท้ายจนกระทั่งคลอดรวม 40 สัปดาห์ หรือนับตาม fertilization age (conception) นับจากวันแรกที่ปฏิสนธิจนกระทั้งคลอดรวม 38 สัปดาห์ ช่วงปฏิสนธิจะเกิดก่อนการตกไข่ 4 วัน และหลังจากการตกไข่ 2 วัน

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