The “Pediatric Fever Fighter Dosing Card” is a simple but brilliant invention: a double-sided card with an inner sliding sleeve that quickly highlights the exact dose of infants’ or children’s Acetominophen or Ibuprofin, according to your child’s weight—which is, by the way, the right way to calculate the dosage (rather than by age). $3.99 (and free shipping) at meinsteininnovations.com.