First, there's the issue of the dosage. The only one I can remember is 10 mg per kg for Paracetamol. Even for that, more often than not, I ask him to compute the exact dose for me so I don't need to do it myself. Self-reliance is, after all, one of his strong points.
Then when the medicine is being administered, if the child is supposed to get 4.5 ml but her sister bumped into me when I was giving it and I spilled some, how much more should I give? And what about when the baby spits some of it out and there's nothing more in the bottle?