In the second trimester, a monthly visit to the doctor should be scheduled, and it will review how uterine height increases, how blood pressure and all vital variables behave.

The doctor will examine symptoms and look for signs to determine if they are expected changes during pregnancy or if they indicate a disease. Between 20 and 24 weeks, the second trimester ultrasound should be performed to study the fetal morphology and to rule out the presence of fetal malformations or alterations.

It will also rule out the presence of gestational diabetes, which is almost always a transitory state of altered carbohydrate metabolism (sugars and flours).

Urinary and vaginal infections that are associated with premature delivery will be discarded and treated. Micronutrients (vitamins) that reduce the possibility of anemia (iron and folic acid), or supplement to promote fetal (calcium) growth, will be continued.