My career/job

I could probably even argue that babies can't lie, unlike adult patients, so you are less likely to be mislead by them not being truthful or actively hiding information from you.

Perhaps their overly concerned parents that accompany them will be happy to fill you in with the required (m/d)isinformation to make your prospective job a fun challenge.

Then again, if Dawkins is to be believed, IIRC, a parent is only a little more than half as concerned with the survival of their child as they are about their own, so with some luck, they'll give you a break.