Dear Doctors: My daughter and my daughter-in-law got pregnant at the same time. They just had their babies, and something that keeps coming up is the idea of the fourth trimester. That’s not a term that was used when I had my own children, and I would like to learn more.
Dear Reader: As most people probably know, the 40 weeks of pregnancy are divided into trimesters. These periods of about 13 or 14…