IS YOUR STOMACH LIKE THIS

Ok so I am 177cm tall and weigh 90kg, I put 10kg on since my boy was born and am slowly being healthier and more active but I can not get over how weird my stomach looks now!!! It's sags down lower than my waistband but it's flat at the front and curves under its such a weird shape!! Does anyone have any tips on getting rid of this or any idea why it's this shape!