It depends on the age of the child and any medical conditions they have, but the standard for foster children in Missouri is $258 a month for birth to age 5; $355 a month for … ages 6 to 12; and $372 a month for children 13 and older.n some states, foster parents are in fact paid a perdiem for each child. An average in Texas is $30 per day per child. This is meant to cover the child's expenses (other than medical) but it isn't reimbursed.