After birth is there any fast ways to lose all pregnancy weight ?

I was told bf can lose alot of weight. But unfortunately I don't have enough bf for my baby so now he's on formulae. I was kinda depressed about my weight too. Bought every god damn slimming gel I can, even tried slimming coffee after I stopped bf. But till birth to now, I've lost 10kg. Think gradually we'll Al lose weight. Cos we'll lose the water retention. But I eat lesser portions and try to only eat rice or noodles once a day. Hopefully it helps. Drink enough water too! If not will have water retention. Hehe.