DS2 was in for D&V and on the verge of dehydration sometime this year already. He's quite underweight usually, and they keep taking blood, he's plumped up a bit recently though, so hopefully won't have all that hassle this time.
He's also had lots of tests as a newborn and lots of days in hospital for jaundice, which turned out to resolve itself. (bloody HV's)
DS1 couldn't bloody keep out of the place for his first 2 years with Group B Strep Pneumonia (nearly died at 2 days old), Bronchiolits, Night Terrors/Parasomnia.
Plonkers, both of them.