There is a growing movement to recognize pregnancy as four trimesters long, a departure from the traditional and historical three-trimester, gestation-only version. Dr. Harvey Karp coined the phrase. Why add those extra three months postpartum? To give your family time to absorb and adapt to the physical and emotional adjustments of caring for a newborn. 

Here's what you can expect from the journey of preconception to life with a little one.