After I had my children my nipples turned very dark. Is there any suggestions to lighten them back?

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Just time. But if you're that worried, I suggest talking to your doctor.

perhaps a natural lightener like lemon juice?

Mine have stayed a bit darker, but not as dark as when I was pregnant. I still have a bit of the line up my belly and down from my belly button too (Linea nigra) it's barely there now, but it's been over a year so I'm guessing for me both will still fade with more time. My a
areola did get bigger, too, and that hasn't changed back at all. Or atleast not that I can tell.

Mine turned fairly dark as well, but have lighted up quite a bit since. They're not pink like they were before, but they are a lighter brown color now. I don't know of anything to physically do to make them lighter, but time does help a little bit.

For women whose nipples have darkened, there isn't much you can do. (Dear Lord, I wouldn't put lemon juice on your nipples! Not only is the darkening deep in the tissue, as it was hormonal and not sun caused, but the lemon juice will burn and could throw off your Ph balance of the nipple and areola.)

Some women experience darkening, and it's from hormones during pregnancy (not from breastfeeding, it's the pregnancy hormones that cause darkening, similarly to how you get "The Mask of Pregnancy" and from the very same hormones. Breastfeeding hormones should not cause any darkening.) Not much can be done, but to wait and hope they fade if you don't care for the darker color.

Every woman is different. I've had 5 pregnancies, three to term and have more than eight years of breastfeeding, and mine are very light. (It's been 9 years since I breastfed anyone, and 13.5 years since my last pregnancy ended) I did, however, get The Mask, and it lightened over time. My Mask was aggravated by my going out in the sun during by first and second trimesters of my last pregnancy without sunscreen. But, I know it could have happened anyway, but was made worse by the sun. I used cosmetic lighteners on my face (from Olay, L'Oreal and Neutrogena) DO NOT use anything with Hydroquinone, (like Porcelana) this is a drug made from quinine and can interact with other meds and cause serious side effects like dizziness, nausea and can burn the skin!)

You can try one of the cosmetic "skin tone eveners" (just so they don't contain Hydroquinone) but stop if they burn or you get any side effects. Your nipples get a higher dose of hormones during pregnancy than your face does and the darkening goes deeper into tissue, so the cosmetic lighteners may or may not work. These usually take several weeks to several months to work. If you do ANY tanning at all, either bed tanning or in the sun, keep your nipples away from the sun!

My guess is that, aside from time, not much will work. But, you can try the cosmetic eveners.

There are plenty of whitening treatments in Asian, Arab and African shops. Most of them contain hydroquinone which can cause cancer, so be careful. Something like papaya whitening soap probably wouldn't hurt.