This is the same principle behind stomach binding. Another thing to think about when attempting to regain your pre-pregnancy shape is this: How you get up from a lying position? You hear baby crying in the evening and you leap out of bed by bending your abs and jumping up unsupported by your arms or hands. Not good at all. Rather of that maneuver, try using your arms and hands to support your body weight while getting up from a resting position. When you simply spring up you are triggering more stress and strain to your currently deteriorated stomach muscles and if you have diastasis (a separation of the lower abdominal muscles that most mothers have) then you are truly harming those abs. Try to retrain yourself to get up gradually while supporting your abs.

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