It depends:
So, for someone baptized validly as an infant is an infusion of habitual grace:
a) of sanctifying grace in the depths of the soul, and
b) of the virtues of faith, hope, charity, and many other virtues.
This means that the Holy Trinity is dwelling in the soul as in a temple (this occurs through the Sacrament by incorporation into Christ Himself). No actual graces (these help to move our wills to act) are given yet since the infant is not developed enough to be able to exercise his mind, memory or will. Later on when he is developed enough, internal actual graces to move the will to act are given (e.g., to pray) especially in conjunction with exterior graces (the example of one’s parents, reminders, such as holy pictures, direct catechesis, etc.).
For the unbaptized person who already has the capacity to think and decide, it is the reverse: first actual internal graces to believe, or pray, or act are given, in conjunction with external graces (like preaching the word, example of others, events that move us, religious symbols, etc.). If these actual graces are accepted, then God grants the grace to decide to believe and the person is baptized, receiving the habitual graces of 1) sanctifying grace bringing the Trinity into the Soul (thus removing all sin); 2) of the virtues (permanent powers) of Faith, Hope, Charity. The person is thus justified by Baptism because of number1 and given radical powers to be a Christian by number 2. Actual interior graces (passing helps) are also given, in conjunction with exterior helps to activate these powers given.
Notworthy