The parents choose to baptize their child in the Church or not. The baptized makes their free will choices as they come of age in knowing right from wrong, following and believing in Jesus, etc.
This is quite different from belief that a fetus is either saved or doomed in the womb - with no free will choices ever, and nothing possible changing their salvation one way or the other.
If one seriously believes that about predestination then it's an anything goes life. You can be absolutely evil or garden variety dispicable and it will NEVER matter. Even the OSAS can't compete with that because even they "made" a choice.