One of the main characteristics of the foetus in the 15th week of pregnancy is that it begins to suck its thumb, as the sucking movements are exercised.
In addition, the eyes are closed, but the eye structures are formed. The lungs and kidneys are beginning to function, although it is not yet able to breathe air.
Read the full article on: What Happens During the 4th Month of Pregnancy? ( 74).
By Elena Izquierdo Trechera M.D., M.Sc. (gynecologist), Marta Barranquero Gómez B.Sc., M.Sc. (embryologist), Rebeca Reus BSc, MSc (embryologist) and Sandra Fernández B.A., M.A. (fertility counselor).
Last Update: 01/04/2023