Just like real life, your FUNSIES child can become ill. Sometimes it's due to things you could have prevented, and other times it just happens (such as mumps, measles, colds etc).
To heal your child:
1) Buy medicine (not a vaccine) for that exact illness. Nausea requires nausea medicine, vomiting requires vomiting medicine and so on
2) Rez, DO NOT WEAR, your child and rez the medicine
3) Touch your child for the menu and select “health”
4) Select the illness and the medicine will heal your child