Whether an angel is appointed to guard a man from his birth?

Objections

Objection 1 : It would seem that an angel is not appointed to guard a man from his birth. For angels are "sent to minister for them who shall receive the inheritance of salvation," as the Apostle says (Heb. 1:14). But men begin to receive the inheritance of salvation, when they are baptized. Therefore an angel is appointed to guard a man from the time of his baptism, not of his birth.
Objection 2 : Further, men are guarded by angels in as far as angels enlighten and instruct them. But children are not capable of instruction as soon as they are born, for they have not the use of reason. Therefore angels are not appointed to guard children as soon as they are born.
Objection 3 : Further, a child has a rational soul for some time before birth, just as well as after. But it does not appear that an angel is appointed to guard a child before its birth, for they are not then admitted to the sacraments of the Church. Therefore angels are not appointed to guard men from the moment of their birth.