Rolling, Rolling, Rolling

So tonight I put my wee being down on her back and when I went to check on her, she had rolled onto her side.  It was very exciting, but now I am terrified that she won't be able to breathe.  It seems like every new step forward provides me with a new worry.  I guess I should probably get used to that.  Still, it is very exciting.  She is almost four months old and I feel like she is already growing up so fast.  Every day is such a blessing.  I love her more than I could possibly have imagined.  Those smiles absolutely kill me.