Any dog can be relatively good with kids or, on the flip side, be very bad with them. While it's nearly entirely up to you how your dog ultimately behaves, there are nevertheless some breeds that are basically predisposed to having a somewhat short temper. Chow Chows are one such breed, and they often top the lists of dangerous dogs listed by apartment owners, canine Web sites, and entire nations. These dogs have long been bred to be fierce. Despite the pleas of many people who say they can be sweet, good intentions can quickly lose out against thousands of years of intended aggression.
That stated, the short answer is that Chow Chows are not recommended for kids or to live in homes where there are children in your family. This especially goes for households with babies, toddlers, or very young or small kids. It's not that the dog wants to hurt your child, but they don't understand that kids like to explore. Likewise, a child is most likely not going to understand that when a dog doesn't want to be touched or otherwise bothered, they give a series of ever-aggressive signals. Chow Chows tend to go through thiese steps very quickly and sometimes even skip a couple and go right to biting.
If you have a Chow Chow in a home or yard where other folks' kids like to play, this could be dangerous. Chows require a great amount of training, they need their owners to introduce strangers and even old friends, and they are notorious for putting their desires first. If a gaggle of neighborhood kids gets the idea to launch onto your property, this could be disastrous if there's an unsupervised Chow there too.
While Chows and children are not impossible to live together, it's probably for the best that only the most experienced Chow Chow owners allow kids to be around these dogs.