Hi Mam I Had A Special Child Aged 5 Years.me

Hi mam i had a special child aged 5 years.me and husband are got married within the family,
My son born with lack of oxygen supply due to that his condition is like that.but i have a plan of second child and i am taking folic acid suppliment for past 3 months.please tell me all possible way to deliver a normal child and my age is 30 and my husband age is 36.

Thanks waiting for a positive reply