Don't say diet! Diets equal deprivation, and no one -- especially stressed out, over-tired new moms -- can survive on a deprivation diet for long. Instead, focus on healthy, filling foods, such as fruit smoothies, yogurt, green leafy veggies, fortified cereals, dried fruit and lean meat.
"You shouldn't really be on a diet right away post-baby," Dr. Wilder says. "Consuming less than 1500 calories a day can be really dangerous and can put your milk supply at risk if you're breastfeeding." If you absolutely insist on cutting calories, wait at least six weeks and consult your doctor first.