During the fourth month of pregnancy, embryo development continues. Fetal weight increases considerably—from 16 g to 100 g. As for the length, a major change occurs, too: it grows from 8 cm to 18 cm.
Fetal development at month 4
By Elena Izquierdo Trechera MD, MSc (gynecologist), Rebeca Reus BSc, MSc (embryologist) and Sandra Fernández BA, MA (fertility counselor).
Last Update: 11/14/2018