The trick is to not gain a ton of weight while pregnant. That’s the trick. Eat like a normal healthy person. Drink a gallon of water a day. Eat 70g of protein a day. Cut out empty carb and sugar calories. You’re growing something so you won’t have a lot of excess stomach space. And space gets even smaller as time progresses. I understand not everyone can do it, but those are the tricks. I gained 18 lbs and had huge babies. After birth ... there just isn’t a lot of weight left. Forget ever getting back to any semblance of the heroin chic look though. Most guys don’t like it anyway.