The Catholic Church that the souls of the justified go to heaven. If they have sinned since Baptism but have been justified again through the Sacraments of Penanance and/or Extreme Unction these souls may not go straight to heaven but spend time in Purgatory.
The guilt of Original sin is not imputed to individuals, therefore deserves no temporal punishment. Babies once justified by Baptism cannot sin until they reach the age of the use of reason and so incurr no temporal punishment, time in Purgatory and there is no reason why, if they die they should not go straight to heaven.
“Faith is a supernatural gift of God which enables us to believe ‘without doubting’ whatever God has revealed.” (Penny Catechism). I would suggest that ‘without doubting’ implies certainty rather than pious hope. Knowledge of the Truth comes to us through reason and revelation and is the object of the intellect the function of which is ‘to know’ not to take a punt or a gamble upon what is true or not true.