Ummm...yeah...in this case I would give the child a quick bath or shower. I had it happen once where the child had an explosive poop that ran into his shoes (we were outside). I put him into the tub to take off his clothing and then gave him a quick shower with soapy warm water. I would definitely bath the child if it were in her hair! I would just tell the parents what happened after. It is unsanitary to have the child going around with traces of poop in her hair for the rest of the day...it can spread disease. On a normal basis I would not bath dck's, but in this kind of circumstance...it is needed!