Hi Agiro
There is a simple answer and a more complex one.
The simple answer:
No. You would have to gain/lose a massive amount of weight in a short period of time to affect the size and shape of a tattoo.
Complex answer:
Tattoos do blur and ‘widen’ a little with age. This is because the ink spreads so if you get very fine lines there is a chance they can go ‘blobby’. How much depends on the condition of your skin, if you smoke, and sun exposure etc.
Stretching is most likley to occur on the belly if you get pregant or discover beer. Tattoos can be puleld a little out of shape straight after a pregnancy – but normal toning usually solves this.
Excessive beer just gives you a budda belly.
Hope that helps.
Take Care
Matthew