There's lots that children will enjoy in Delhi, though the city is a sensory onslaught no matter how old you are, so taking it easy is key. Staying in South Delhi, or in homestay-type accommodation, will make for a less hectic experience. South Indian food is less spicy than North India's Mughlai cuisine.
Need to Know
Nappies are widely available, but baby-change facilities are almost non-existent. There's a reason locals don't use pushchairs: lack of pavements in many places, traffic and crowds make them more of a hindrance than a help; you'll be much better off bringing a sling or a baby rucksack for toddlers. Rickshaws are always available for easy (and fun) transportation.
There's a wide range of international restaurants to suit the fussiest palates, and some good child-friendly hotels. For a homey feel, homestays are a good choice. All-age attractions include the National Rail Museum, cycle-rickshaw tours of Old Delhi (or indeed cycle-rickshaw rides anywhere), picnic visits to Lodi Garden, and rambling around forts such as Purana Qila and the Red Fort. Tours with DelhiByCycle are great fun for families, while older kids may be fascinated by street walks with the Salaam Baalak Trust, Street Connections or Reality Tours & Travel.
Best for Kids
Delhi isn't an obvious family destination, but kids, just like adults, will be fascinated by the intensity of the experience; just sharing pavements with cows and monkeys will delight most children, and the colours, sounds and unusual sights will hold the attention of even the most reluctant teenage traveller. And if all else fails, hop on a cycle-rickshaw; kids love them.