Don't worry. Is it the Children's motrin suspension 100mg per 5ml?
Because 5ml = 1 tsp which equals 100 mg of motrin in the children's suspension liquid
So if you did 1/2 tsp that equals 50 mg of motrin.
For infant dosing, for infants 12-15 lbs, according to my pediatrician's dosage chart, you would give them 1.25 ml which also equals 50 mg.
So actually, it sounds like you gave her the right amount!
That said, you aren't supposed to give Motrin to babies under 6 months.
But still I wouldn't freak out.
