Hong Kong is a great place for older kids, since many of the attractions are geared toward them and even offer discounts for children, sometimes as much as 50%. Public transportation is half price for children. As for very young children, keep in mind that there are many stairs to climb, particularly in Central with its elevated walkways, and in subway stations, making child backpack carriers easier than strollers. Also, young children may not be welcome at finer restaurants.
Many hotels allow children under a certain age (usually 11 and under but occasionally up to 18) to stay free of charge in their parent's room. Generally, only one child is allowed, or there's a maximum limit of three people per room, and no extra charge only when no extra bed is required. Baby cots are usually free of charge, and many hotels also offer babysitting for a hefty fee.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.