We are planning to go on approx 2 month trip with our son who will be 2.5years when we go. So if anyone has got any experience or advice about which areas in Thailand, Cambodia, Vietnam etc..are best or things we need to take into consideration when planning are trip so that it's as pleasant for him as it is us then it would be greatly appreciated as at the moment I'm a bit clueless! Also if they're are any other helpful websites aimed at travelling with children.
Travelling with kids in Asia can be fun but also very testing! For starters, roads in Cambodia, Thailand and Vietnam generally don't cater for strollers its even dangerous for regular pedestrians too) so I think it's best that you bring a back-pack type carrier. But the upside is, Asians are very tolerant of children and may even look out for them for you. I guess it has to be that Asians are more family-oriented.
There's lotsa outdoor activities for you son in Chiang Mai and even the parents can have a good time. The nightmarkets of Tah Peah gates, elephant trekking and bamboo rafting is something everyone can enjoy.
In Bangkok, there are alot of public parks like Lumphini park. Jim Thompson house has a very comfortable and laid back ambiance for the family; nice cafe overlooking a koi pond. Take a 5 hour bus ride out of the city and you may even take your family to a not-so-crass Thai Island; Koh Chang. It does not have as many tourists as Pattaya but it has enough things going on to keep you guys entertained.
That's all I can think for now. Have a great trip
All I can think of right now is: Do not forget bugspray. Both of you will enjoy your trip better.