Options for Lax Abdomen Skin but No Muscle Separation?

I've had three children in 4 years, the last one 6 months ago. I can handle the stretch marks (when compared to the scar a full Tummy tuck would give) but not the laxity in my lower abdomen. What would you recommend.

P.S. I haven't done any exercise yet, just running around after 3 kids. I have very little (if any) muscle separation.

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