Having had a child previously does not mean that there cannot be infertility problems when seeking a second pregnancy. When this happens we are dealing with a case of sterility or secondary infertility.
The causes can be the same as in primary infertility, so the appropriate male and female fertility tests should be performed to determine which of the aspects mentioned above is causing the problem.
Read the full article on: What are the main causes of sterility and infertility? ( 50).

Sara Salgado
B.Sc., M.Sc.
Embryologist
Degree in Biochemistry and Molecular Biology from the University of the Basque Country (UPV/EHU). Master's Degree in Human Assisted Reproduction from the Complutense University of Madrid (UCM). Certificate of University Expert in Genetic Diagnosis Techniques from the University of Valencia (UV).