After giving birth, I was totally unprepared for the fact that I would be crying almost constantly in the first few months with my newborn. Here are just 4 reasons why moms cry in the first few weeks postpartum: 1. Because we’re so freaking happy The first time I looked into my son's eyes, I burst into tears. The first time I saw my son’s dad hold him, I burst into tears. Then I cried because I felt so lucky I got to experience motherhood. Get ready to ride the emotional roller coaster.