Drink more water.
Eat lots and lots of protein and veg. Your body is trying to recoup after creating and delivering an entire human being. Your hunger is its way of telling you it needs nourishment. Calcium is really important too.
It's so easy to fall onto the trap of reaching for the easy calories that deliver instant energy in the post partum period when you're getting by on very little sleep.
If that's happening, stop! Easier said than done - but you need properly nutritious foods.
Buy in supplies of Greek yogurt, baby carrots, bagged salads, cooked chicken, tuna, good quality peanut butter (avoid added oils), whole grain breads and pasta, cheese, hummus, and eggs. Make sure you have filling breakfasts - eggs are ideal - and snacks (hard boiled eggs, yogurt, cheese, carrots). Lunch can be a hearty soup made from real stock not a stock cube, with beans/ lentils/ veg/ chicken/ pasta added, whatever you prefer. Dinner should be meat and veg/ salad, with healthy carbs - whole grain pasta, sweet potato, white potato, brown rice.