Iron supplement and stained teeth
DS was iron deficient at his 12 month checkup because I breastfeed and was anemic without know it. So, pedi put DS on an iron supplement for 3 months. (And I'm on one now, too, of course.)
1 month into it, his teeth are waaay stained. A lovely greyish yellow color. 
I know the staining is supposed to be temporary or that baking soda should remove them. I have two questions:
1) If LO was taking iron and got stained teeth, how long did it take the stains to fade once s/he went off the supplement?
2) Has anyone had luck getting LO to allow you to brush his teeth using baking soda? If so, how? Just brushing DS's teeth with a little water is a daily struggle, so I can't imagine him allowing me to polish them with a yucky baking soda paste.
Re: Iron supplement and stained teeth
Some Sort of Nonsense (My Blog)
^ That! It's actually the calcium in milk that interferes with iron absorption, so you should avoid giving iron with any food/drink that is high in calcium. On the other hand, Vitamin C enhances iron absorption, so, for example, giving the iron along with some orange juice is a fab idea.
I do try to give DS some water in an open cup to drink right after I give him the iron, and I try to squirt the drops far back on his tongue. It's obviously not working very well, though. As for giving him the supplement in a cup of water or juice, I can't ever get him to drink it. I scared him away from his sippy cup for the better part of a day when I tried to sneak the iron in it.