How long does it take for PDA to close in newborn?

Understanding PDA Closure in Newborns

When a baby is born, their circulatory system goes through a remarkable and rapid transformation to adapt to life outside the womb. One of the key changes involves a temporary blood vessel called the ductus arteriosus, which connects the main pulmonary artery to the aorta during fetal development.

In most healthy, full-term newborns, this vessel begins to shut down very quickly. Functional closure typically happens within the first 12 to 24 hours of life. This swift change is triggered naturally by a rise in oxygen levels and specific chemical messengers in the baby's bloodstream, causing the muscles within the ductus to contract tightly.

While the blood flow stops almost immediately in terms of function, complete anatomic closure—where the tissue permanently seals and transforms into a fibrous ligament—is a gradual process. This structural healing can take anywhere from a few weeks to a couple of months.

In some cases, particularly in babies born prematurely, the ductus arteriosus may remain open longer than usual, a condition known as a patent ductus arteriosus (PDA). Doctors closely monitor newborns for this, as medical treatments or procedures are sometimes needed to help the vessel close if it does not happen naturally.