For this maternity girdle we recommend you to measure the circumference of your belly (from the lower back to the bottom of your belly which is around the area where the belt will be worn) and choose a belt according to the belt sizes in the description in the lower range of your measurement in order to plan for belly growth.
S: 34-38" / 86-96cm belly circumference;
M: 38-42" / 96-106cm belly circumference;
L: 42-46" / 106-117cm belly circumference;
XL: 46-50" / 117-127cm belly circumference;
XXL: 52-54" / 127-137cm belly circumference.