Dependson the age of the child.
Infant/toddler? Follow them and take them out when they're not carrying fragile cargo.
Old enough to take a fall? Kill them at range. Preferably with a .300 WinMag.
Old enough to not be my problem? Find out what kind of furry/scalie they are. Possibly invite to dinner. Nothing too nice, obviously, I dont want a kidnapper thinking I have that kind of money but somewhere pleasant :Ps