You can also try a lightweight, silicone-free conditioner diluted with distilled water in a spray bottle (Suave and White Rain are usually silicone free).
California Baby is always brought up in these forums.
For the record, if you wanted more information on caring for curly hair, and specifically for your child's curly hair, check this thread out - there are a lot of curl-specific links and a few peppered throughout the thread for how to care for kids' curly hair:
The best thing that has worked on my kids curly hair is mayonaise. I used it when they were exposed to lice, and it was the only thing that has ever gotten ALL knots out without me having to do anything. Plus Asha, who has the coarse curly hair, whose hair normally feels like straw was nice and smooth, more like Nadia's smooth curly hair.
my dd has very fine hair, that is curly on the ends and i use a spray bottle filled with half vinegar, half water, and about 10 drops lavender ess. oil. nothing extra to buy (we use these as household cleaners) and it works so well i use it on myself! it sounds weird but it works Great. i am astonished it hasn't been mentioned before LOL
As part of my natural bath and body care product range, I make a detangler with rosewater and aloe vera gel. My daughter and I (who both have long, fine hair) are the product testers for my products. This works like a charm and smells heavenly. (Plus, the aloe vera gel is a really good conditioner for your hair.