" My parents say they always put me to sleep on my tummy.  But the doctor says our baby should sleep on her back. Most ppl are confused."

When your parents were putting you to sleep, tummy was indeed the position of choice.  That's because experts used to believe that veing tummy down prevetned babies from choking on their spit up while the slept.  But more recent research studies indicate that the back position is the safest by far.  Studies show that back sleepers have fewer fevers, fewer problems with nasal congestion, and fewer ear infections than tummy sleepers, and are no more likely to spit-up during the might (or shock on their spit -up).  But by far the most important reason why back sleeping is safer: Placing babies ot sleep on their backs sharply reduces the of crib death (SIDS).  This compelling evidence has prompted the back to sleep campaign of the American Academy of Pediatrics, which recommend that all healthy infants be put to sleep on their backs.

Start by putting your baby sleeping on her back right away, so that she'll get used to and feel comfortable in that position form the get go.  Some babies fuss a lot on their back becasue their flailing arms and legs don't have the mattress to snuggle against, they may lead to slightly more frequent wakings.  If you swaddle your baby it might reduce the wakings because the baby will feel secure. 

By putting your baby back first will make a bald spot and also a flat spot but this is go away shortly.  If you put baby on her stomach while playing will not only increase the strength in the upper body, but will minimize the flat spot or bald spot.