S.T.
i say explain to the daycare and see what happens. I have "stubborn sleepers" myself. my 2 1/2 year old would not sleep on his back, period. he would only sleep on his side, his right side to be specific, until he was close to a year old. if you layed him on his back he rolled straight to his side, from the day he was born. once he learn to roll over etc, very rarely would be roll onto his tummy to sleep, now he is all over the place. my 8 month old twins would not sleep on their sides when the were born, would roll right to their backs. then they were strict side sleepers after a few months. now, the vary. good luck with the care center.