A mother of 2 yr being seen by NP for a well child exam and states that her mother has encouraged her to allow the child to sleep on their tummy. the NP's best intervention at this time is to

a. recommend they continue this safe sleepung position
b. advise the mother to put the child to sllep on her back
c. recommend they swaddle the child sleeping until 3 months old
d. advise the mother to have child sleep on pillow