If you're not happy with it, don't do it, it's as simple as that. If kids suddenly started loving my jewellery but wanted me to make more kiddy stuff, I wouldn't do it, because I'm not happy with that.
If you're worried about the reputation and can afford to miss out on some sales like that, then don't do it. If, however, you NEED the extra money, you might want to think on it.
Consider yourself lucky that people loved it that much. However, I totally understand your hesitation. If I were in your shoes, personally, I wouldn't do it. But that's just me.