How to fix post-pregnancy loose tummy skin?

I am wondering what my options are to fix loose skin around my belly button and flatten my stomach. I have been looking into a non-surgical solution and it has been suggested to me (by a cosmetic surgeon) to have 3 treatments of Infini RF (micro-needling) and possibly Sculptra, if required. Do you think this non-surgical solution would work or do I need a tummy tuck? If a tummy tuck - would it need to be a full tummy tuck or can I get away with a mini tummy tuck?