When do babies start to flip/roll over?

Hi Mummies, Can I check by what week or month do babies start to flip or roll over? My boy is 10 weeks old and still doesn’t show any sign of rolling over. Is it too early ? I still swaddle him to sleep as Moro reflux won’t let him sleep otherwise. Doctor told me to keep swaddling hun until he starts rolling over #firstimemom #adviceplease