we have just got our new 8 week old pup can we bath her or is there a certain age to do this

What breed is she? Why do you think she needs a bath? If she is smooth-coated, unless she is really filthy and stinking it is best to avoid baths for as long as possible, ideally for ever.

All the breeders I know would wash and groom the puppy before you pick it up, so I would think it unlikely that the pup would need a bath but if it does then I would let it settle in for about 10 days first.

my pup got a bath at 9 weeks, i had had her 4 9 days at that point (she is a short haired breed) but i want her to do hydrotherapy to help her muscles when she gets older and i want the water 2 b fun not scary and put in a sling, above the water. she absolutly loved it, but il only do it every couple of months because it takes the goodness out of their fur which they need