no I actually didn't get back in at the train station office. They told me I had to stay or try the land border. Went to the land border and they grilled me pretty hard as to why I was going back when I had just arrived. After lots of head shaking I eventually got stamped.
Thanks Robert. The only one of concern is the small pox vaccine. That was never made aware when I was getting my visa from the UK. As per the royal Thai embassy guidelines, it isn't mandatory.
For dependent child (age below 20 years): A copy of birth certificate, a copy each of employment letter, passport and visa of the parent who is going to work in Thailand, and a copy of registration of the company or organisation where the parent will work
Just found this on the Thai embassy website for a non O visa. What I'm getting from this is that I can get this visa to care for my child whilst my partner is working.