It would be complicated, but it would definitely be possible.
As a general rule, in those types of prosecutions, children are rarely called upon as witnesses. They may sometimes be called as informants. Children can give us information, but it is still quite rare for children to act as witnesses.
The issue of children is more a problem in terms of protected children rather than child witnesses. There are probably exceptions, such as 16- or 17-year-olds who may be associated with street gangs, for instance.