Hi,
Yes, it should get figured right in to the amount he pays each month - typically each state will have a worksheet guideline that includes either a base cost or % for childcare and medical basic monthly expenses, in addition to what they call the "cost of the child".
I'm not sure about Texas - but most states then figure out a % for each of you and that is what you pay for additional childcare, medical co-pays, extracurricular activities etc.
It just depends on who agrees to what though...... you can modify anything as long as you both agree.