Make sure that your child is willing to commit a minimum amount of time and
effort to dreadlocks before giving in.
Dreadlocks are permanent and kids change their minds daily. Be sure that your child understands the dreadlocking process before making, I mean allowing him/her to commit to this style. If your child comes home excited about getting dreadlocks after seeing Lauryn Hill, Malcolm Jamal Warner or some other celebrity, it's important that you explain that dreadlocks are permanent.

Even some adults have difficulty understanding that the only way to change hairstyles with dreadlocks is to cut them off. So take whatever steps are necessary to prep your child for this permanent transition. Try not to treat dreadlocks like a chore but more like a rite of passage that one must endure for at least "x" years. This way, at the end of say two years, if you and your child are not satisfied, cut them. Your child learns a valuable lesson on being committed and that change can be positive.
In the end no matter how well you prepare your child for having dreadlocks, there's no guarantee that they'll receive a warm reception once outside your door. Kids, and some adults, can be openly critical of what they don't consider "normal." What if your child has an ugly-duckling stage? Dreadlocks won't necessarily increase her/his popularity or help with self-esteem.
Although you can serve as your child's backbone the majority of the time, it's important that if she/he is dreadlocking that you help them develop one of their own before the process begins. Make sure they know they're know and feel their special with or without dreadlocks because then, it won't matter what the world thinks.