T.K.
Hi,
My husband and I went to Thailand as our last vacation before having our first child 2 years ago, and we had a blast. We went to Bangkok and Phuket. I would recommend against going to Bangkok with your chiled unless you plan on just staying at a very nice resort as it is a very busy and a rather aggressive city, but Phuket was very beautiful and peaceful. We were quite surprised to find how kid friendly the resorts were and at how many people had brought their young children to this particular resort we stayed at in Phuket..... The fruits were amazing and if you love massage, you can get one for very cheap... The flight was VERY long, and you might want to check with your Pediatrician regarding any particular vaccines your child may need prior to going, but we did see many families who seemed to be enjoying themselves with their babies at the pool where we stayed at and it was a very reasonably priced and a clean hotel. you can check it out at: www.katathani.com
Hope this helps!