If you're in the UK, Mothercare sell Miracle Blankets as 'swaddle blankets'. They're the exact same design.
Giorgina, in the UK, the official advice is firmly to put babies on their backs to sleep until 6 months. That said, there are several mums on here who have sworn by tummy sleep, and my own LO slept much better on his tummy after about 3 months. As long as there are no other SIDS risk factors, if it were me (and it was) I'd try it.