Nearly twenty-five years ago, my Didi (my uncle's daughter) was a toddler and I was still a baby. She had picked up some kind of infection, something that upset her stomach, so she was taken to the doctor. She was prescribed and dosed with some medicine whose name nobody in the family seems to remember any more. What they do remember is the effects.
Shortly after being given the medicine she went along with the rest of our (then) joint family to an invitation. On the way she seemed to get drowsier and drowsier until somebody suddenly noticed that the sleepiness seemed unnatural. She was completely collapsing and couldn't hold herself up at all.
The family hurried to a nearby doctor instead and he immediately diagnosed it as an allergy to the medicine she'd been given, a sulpha drug of some kind, much in vogue then. He gave her anti-allergens and she slept it off and was much better the next morning.
It's a cautionary tale, this one, and somewhat tangential perhaps to the FAAM but the importance of testing a child's reactions to medicines cannot be stressed too highly. We tend to be hyper parents of infants and be more lax when they reach the toddler stage. Well, this is not about being hyper 24/7 but carefully watching a child until you can undeniably see that the medicine is being entirely beneficial. This is also about something else I learnt from my father -- being absolutely anal about maintaining medical records: yours as well as your children's. The sulpha allergy surfaced earlier in our aunt so it was less of a shock to the family. But it pays to know the allergies within your family. And it pays to write them down and file that in a place where it's easily accessible.