Abdominal surface stretches out after pregnancy. If skin quality is poor, it tends to lose firmness. Abdominal muscles stretch as the skin stretches in pregnancy. Abdominal muscles grow apart from one another, forming a gap in between, which is called diastasis recti. Intra-abdominal organs stress outwardly, causing a convex appearance on the abdomen. Abdominoplasty surgery involves an incision similar to a caesarean section to correct the gap in between the muscles with sutures, and convex appearance is eliminated. In addition, the saggy skin is removed for a firmer and flat abdomen.