The desire to have children is a matter that concerns modern couples sooner or later. However, it is estimated that one out of six couples does not achieve this goal without medical assistance. Normally, fertilization occurs when the mature egg is fertilized by a sperm. If this does not happen, there is a failure to conceive, and consequently infertility is mentioned.

See more:

• The process of natural conception
• Requirements of conception
• When should I visit a doctor
• Infertility