I think this is the most appropriate section to ask.

For foreign children born in thailand hospital, will they get birth cert?

Heard from someone that if the children with thai birth cert who study in thailand for more than 10years, they can get residency?

For foriegn children who are born in a Thai hospital, they will of course get a birth certificate. Unless one of the parents is Thai, the children are not Thai and never will be. The birth certificate will simply show they were born in a hospital in Thailand. It will list ther mother and father...and if the mother and father are not a Thai citizen the children will be listed as non-Thai. It doesn't matter where they are born, the determination as to whatever they are Thai or not is based on the nationality of the mother's or father's nationality. As I said, if one parent is a Thai citizen, the children will be Thai.

As for the children of foriegners who go to school in Thailans...even if they attend a Thai school for all the school time, they will never be Thai. In other words, there is no such law as you say you heard.

Fortunately having kids to a Thai wife means they can attend the Thai school system for free if funds are an issue. You cannot do that with foreign kids that I am aware of.

... Unless one of the parents is Thai, the children are not Thai and never will be...

A minor correction - if both parents have permanent residency, then their children born in Thailand are Thai citizens.

...if both parents have permanent residency, then their children born in Thailand are Thai citizens.

Correct. From the Thai Nationality Act:

Section 7. The following persons acquire Thai nationality by birth:

...

(2) A person born within the Thai Kingdom except the person under Section 7 bis paragraph one.

...

Section 7 bis . A person born within the Thai Kingdom of alien parents does not acquire Thai nationality if at the time of his birth, his lawful father or his father who did not marry his mother, or his mother was:

(1) the person having been given leniency for temporary residence Kingdom as a special case;

(2) the person having been permitted to stay temporarily in the Kingdom;

(3) the person having entered and resided in the Thai Kingdom without permission under the law o immigration.

...