Is there a law to say when is too soon to introduce my new partner to my son? Surely its up to how my son feels and my partner and me?

How old is your son? Knowing this will make our responses more appropriate to your situation.

Also, how long have you and your partner been going out? How serious is the relationship? Is your son's father involved with your son?

You see, we need as much info as possible to formulate an appropriate response.

Is there a law to say when is too soon to introduce my new partner to my son? surely its upto how my son feels and my partner and me?

No,there is not!:D