how old do kittens have to be for their first injections
Report Abuse. Shots come as a 2 part course, and kittens cannot be given the second shot until they are 12 weeks old. The first can be given 3 weeks prior to this. Rabies at 4 months.Worming should be started at 4 weeks, and repeated very 4 weeks until the kittens are homed.eport Abuse. Shots come as a 2 part course, and kittens cannot be given the second shot until they are 12 weeks old. The first can be given 3 weeks prior to this. Rabies at 4 months.