helloooo... my dd was the same, the only place she would sleep was on her tummy on my chest, if that makes sense.... she absolutely screamed if ever layed on her back and could never go in the pram happily for this reason...

it wasn't until she was about 4 or 5 months old when i was at sleep school that she rolled onto her tummy and slept soundly... i was alarmed and asked the nurses if i should move her back onto her back, and they looked at me incredulously like 'why on earth would you do that if she is happy sleeping on her tummy??!!'.......

the sids guidelines are only that, GUIDELINES.... in the end you have to make the decision to do what is best for your baby.... if only i had known that in those newborn days i would have saved myself a lot of exhaustion and depression.... i'm due to have my second in 8 weeks and one thing i am confident in, is that if this baby doesn't sleep well on his back, i will definitely try tummy sleeping in a heartbeat... if it works then that is the way he will sleep...

i'd just experiment and do whatever works... if you are super worried about tummy sleeping you could always buy one of those movement monitors that sounds some sort of alarm if they stop breathing or something like that....

good luck and hope you can find a position he is more happy in :-)