How To Control Stretch Marks On Breast And Stomach?

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hi i m kalpna 7th month is about to start after 2 days,,,,, can u suggest me the ways thru which i can control my stretch marks at my breast and stomach .even i also started loose motion on today will u pls suggest me what to do ? also please suggest me some exercises which i cn do during dis period nd wat diet shld i tak nw.... my weight has been raised to 13 kgs yet.....is it fine???