I'm part of a mom's group....VERY mainstream....and one mom mentioned that her ds got his flu shot today (he's probably about 9 months old...not too much younger than my son) and that next month he has to go back for another one! <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/yikes2.gif" style="border:0px solid;" title="yikes">: I asked why...I thought it was once per season but she said her doc said before the age of 9 they like to give them 2 doses! Extra precaution or something. Somehow I just always assumed it was one. Eegah....the thought makes me shiver of having even one in ds!