Biology · Education

Fetal Growth & Gestational Timeline Lab

Drag to orbit · scroll to zoom · ←/→ day · ⇧←/→ week · space play

Gestational age
Week 20 Day 1
Length
Weight
Heart rate
typical, beats/min
Due date
at 40w 0d
Size comparison
Milestones this week
    Organ systems

    Glowing systems have milestones this week. Select one to spotlight it in 3D.

    Milestones reached so far

    Educational model. Values are population averages and every pregnancy varies; this is not medical guidance. Ages count from the first day of the last menstrual period (1w0d to 40w6d). Length is crown to rump through week 19 and crown to heel from week 20, following the widely used average fetal growth chart; weeks 1 to 7 use embryology references (Carnegie stages). Daily values are interpolated. The 3D form is stylized and posed curled, so it looks shorter than its measured length; stretched out, it matches the chart. Comparison objects are shown at typical real sizes.

    Month
    Scale