Any agent or a condition that can hinder prenatal development and thus, lead to abnormalities in the child or even cause death are termed as teratogens.
Viruses, chemicals, stressors, and malnutrition are all different agents and conditions that are teratogenic.
Exposure to teratogens during a specific period of pregnancy and for a certain amount of time can lead to the development of prenatal abnormalities, such as abnormal characteristics, slow physical growth etc.
Any agent is able to affect the development of a fetus or an
embryo negatively is a teratogen. They can cause birth defect in the baby or
put a halt to the pregnancy.
The sacral bones are a shaped like a triangle and found below the fifth (5th) lumbar vertebrae and in between the hip bones. The joint formed with the hip bones is called the sacroiliac joint.