Many women struggle with that post baby belly fat, me included! I think I struggled with it for 5 years! However, I don't suggest that route...
The key thing to remember is that your abs will come back with diligence, persistence, and of course patience. Proper nutrition and well thought out exercises help too!
First, make sure you get your doctors OK to begin working out again. Even though you may "feel" as though you're ready, make sure you get cleared for exercise. After that, find some you time to carve out for working out. Don't skimp on sleep in the hopes of getting a six pack, but maybe during baby's nap time or even with them nearby. Don't try to work out during feeding times: yours, or your baby's. No matter how athletic you were prior to giving birth, ease back into it. The muscle memory will kick in and you can regain your strength, but Rome wasn't built in a day...
My favorite ab move (especially for sparking that muscle memory) is a straight legged floor crunch. Lie on floor with legs extended straight, toes pointed, and legs glued together so your activating the muscle fibers throughout your legs. Place fingertips behind head for support, then crunch up, drawing the naval towards the spine and the rib cage towards the hip, resulting in the shoulder blades leaving (or almost!) the floor. Return to start and repeat mindfully until you can't do any more with good form. When you begin to lose control of your abs or pull on your neck your form is gone.
Eat for energy because you need it! If you are breastfeeding, don't fall into the "I can eat anything" trap. You only need an extra 200-300 calories a day, so take it easy. Keep your meats lean (chicken breast, turkey breast, pork loin, tuna, white fish), your carbs clean (leafy greens, root veggies, whole grains, fruits) and your fats healthy (olive oil, natural peanut butter, avocado) and you'll be ready to run after that toddler (time flies!) when you need to.
Be patient. Be kind to yourself. Don't neglect your abs. Focus on healthy eats.
This will get you where you want to be.