Advice/help!

Ivy • Mama of 2💙

Hey mamas I’m 18 with a 10 month old and I have Stretch marks on my stomach and thighs and hips and I was wondering if I go swimming do I need to put sunscreen on them? Is there anyway to make them somewhat go away? And I also still have a belly and hips and I was wondering if any of y’all can tell me how y’all got ur body back into shape? Tia