My SWCAH daughter is 17 months & I haven’t noticed her being sick more often than her 3 yo non cah sister.  I have noticed that when she does get sick it seems to hit her faster & she recovers faster as well.  She has vomited twice & had diarrhea once, but nothing that ever required a shot just stress dosing.  Heck with the diarrhea episode she was laughing & playing...I probably could have used a shot (of Tequilla) b/c I was watching her EVERY move & driving myself crazy. 

Jess