Hey there - I have just done 2 months in Thailand with my kids. I had 3month baby in a sling/wrap everytime I went out and traveled - if availble used a seatbeat over both of us. I could also fit my 2yo on my knee if needed but she was usually hubbys responsibility. The traffic may seem chaotic but actually they are very curteous and there is surprisingly few incidents! Tuk Tuks are fun and the drivers will take into account that you have kids - we placed out little ones in the middle. Go and have a fab time - you will never regret going.