The actual process of washing away original sin by the prescribed words and action cannot be repeated without sacrilege, but the new rite has deleted many “extras” that were efficacious sacramentals, notably the exorcisms (I think there were 5 of them). You can ask to have these “topped up” without impugning the validity of the actual “I baptize thee in the Name …” When my wife and I “returned to tradition” we brought all our children along and the SSPX priest “filled in” these omitted parts, but without repeating the baptism itself. Our subsequent children were all baptised in the Tridentine rite, either in our local parish by a diocesan priest under Ecclesia Dei, or by the SSPX.
You will notice that the devil was quietly dropped from consideration in the 70s, so that now many priests are being given crash courses in exorcism. I very strongly advise anyone who had the 1970 Rite of Baptism, to find a sympathetic priest and have the ceremony topped up with the other Sacramentals.