The diaper rash cream is EXEMPT as it is needed for infant care...meaning you can bring it on, even it greater than 3 (3.4) oz. I just went through security (BOS & MCO) last week with Balmex and Children's Tylenol, both over 3 oz and had no issues. I did put them in my 3-1-1 bag so TSA was aware I had them.