Stretchmarks and saggy skin

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Ill start by intoducing myself. my name is ivonne and i just had a baby 4 months ago. During my pregnancy my tummy got really big with a TON of stretchmarks. Although i am starting to diet and exercise im worried about the stretchmarks and the extra skin not absorbing back in the stomach area. Im wondering what you guys recommend for the tummy and if theres any good stretchmark creams you guys have tried to lighten the color of these aweful stretchmarks!