During pregnancy the hands of the body's biological clock run faster and you can see your biological age increase by a couple of years. After giving birth, this process reverses, especially if you are breastfeeding.
This is what researchers from the Yale School of Medicine discovered in a study published in Cell Metabolism. A high body mass index before pregnancy seems to make it more difficult to turn back the hand of the biological clock. The study also showed that there are some factors that influence the recovery of biological age.