During the first month of pregnancy, embryo implantation takes place and fetal development begins. The size of the fetus, however, is still so small that it cannot be detected by means of an ultrasound scan yet.
1 month pregnant: what is the size of the baby?
By Andrea Rodrigo BSc, MSc (embryologist), Silvia Jiménez Bravo BSc, PhD (senior clinical embryologist) and Marie Tusseau (invitra staff).
Last Update: 10/30/2017