[tator]

I have read on YT that some people get their shots at,9,12,16 wks. of age .My vet .told me that my puppy should have his shots 6,9,12,wks. The breeder that i got him from gave him his first shot at 6,wks Then i took him at 9 wks. to get second set ,and he goes monday for third set witch he will be 12,wks.What i am wanting to know is their somthing wrong with giving shots at 6,9,12.wks, he has had no problems with his first 2 sets.He is very healthy,when he got his first shot he weight 1 lb then at 9wks he was 1lb 4ozs,,Is their somthing i should be worried about giving the age he took his shots??