The medical science behind birth of a child has not been yet fully explored and hence the reason for this is not established. However, from what is known, the birth of a child takes place with precocious fetal endocrine activation. The reasons for this could be maternal background, multiple pregnancies (twins, triplets,etc.), infection, etc.

Certain chronic maternal illnesses may be related to preterm labor, such asdiabetes, sickle cell anemia, severe asthma, lupus, inflammatory bowel disease, and chronic active hepatitis. Other conditions to watch for include non-uterine infections, such as a kidney infection or pneumonia; abdominal surgery, such as having your appendix taken out; and trauma to the abdomen.