How do your slim down after delivery? Postpartum 40days alrd and my tum still looks like 5mths preg.

I had traditional massage and binding for a week after normal delivery. For 40 days I had my confinement diets. Its tough my mom was strict so sometime i cheat whenever I goes out to send my lo for checkups. But still no cold or gassy drink. That was for my 1st child. My 2nd I stay on my own so I did my own confinement diets and still did 1 week of traditional massage and binding.