To be honest I expected this because my diet has been really bad - some days I only eat crisps and rubbish. Nothing nutritious. I’m embarrassed to say that but it’s the truth.
so what about changing that, not only for your iron levels but for everything, especially since you have a baby now and you wouldn't the same bad habits for her/him. If you are breastfeeding, a baby will develop your same food preferences. And if you are not breastfeeding, babies learn by observation .
Stop buying crisps and other junk, and decide to have the best possible diet with plenty of colours. Of course, after a sleepless night everyone is allowed to eat whatever lift their spirits, but junk is addictive. It was engineered to make you craving crips, biscuit and so on. However, nice veggies, cooked and prepared with skills can become as addictive. Don't make big food companies rich as the expenses of your health.
Correcting low levels of iron with diet is very hard, so you will need to take supplements. Once levels are back to normal, you can maintain with diet but it requires planning.
At some point, I bought the iron fish luckyironfish.com and then would use the water for herbal teas. I however fell into the other category with iron overloading, so you need to possibly find the iron in food and be careful with supplements once you don't need them.