Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
  • English
Español
Português
Educator Login / Register
Donate Now Get Free Videos

Movie Theater

Blood Cells and Bone Marrow


3 months, 3 weeks

From The Biology of Prenatal Development.Buy Now

Script: 15 hetes korra megérkeznek a vérképző törzssejtek, és osztódni kezdenek a csontvelőben. A vérsejtek képződése nagyrészt itt fog történni.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
See Snapshots   |   Log in to create a playlist
Gender Differences
Gender Differences
Tooth Development Begins
Tooth Development Begins
Blood Cells and Bone Marrow
Blood Cells and Bone Marrow
4D Ultrasound
4D Ultrasound
4D Ultrasound
4D Ultrasound
4D Ultrasound
4D Ultrasound
Previous Set Previous Movie
Next Set Next Movie
When does health begin? Find out now.
Tell your story. Create your own pregnancy calendar.