You should use carries in which the fabric goes UNDER Baby's thighs, and not BETWEEN them,
such as the Front Carry, Double Hammock Style (front PWCC) or asymmetrical positions: Off-Center Front Carry or Vertical / Seated Cradle.
This way, there are no risks of overspreading Baby's legs.
For a Baby younger than 3-4 months, the knees should be bent and always be lined up with the width of his pelvis when he's froglegged in the wrap.
This is how Baby should be positioned under the wrap :
