In newborns, the only 7 way I recommend using is Alpha 7. I'm not entirely convinced it even provides a lot of protection, but in herds with a history of purple gut in young calves, it may be worth using. Alpha 7 stimulates the immune system for a longer period of time then Ultrabac or Vision, which would be beneficial in young calves that still have maternal antibody from the dam. I really don't know that it is a necessary shot in a lot of herds. Duration of immunity is about 4 months, so you will want to give another dose at grass turn out. Alpha 7 is a fair bit more pricey then the other 7 ways, so I would booster with vision or ultrabac.