iron vitamin/polyvisol taking babies Q....

}i{ • Married ~ FTM
Mommies that are giving their LO's polyvisol for iron deficiency, has your baby improved? How long after taking it? We are on month two, last month there was no change, checking later this month again but our little guy is a "healthy" (picky) eater so it's making it a little more difficult to help boost it via foods. Anybody else?