YES, it's suitable for newborns!
The adjustable seat (11 to 38cm) means you can carry a newborn without forcing the natural spread of his hips.
Passing the straps under his legs also gives you a beautiful rolled-up position reminiscent of the one he had in his mother's womb. Your infant is flexed, knees higher than buttocks, lower back rolled up and hands close to the face which reassures him: a "so-called" physiological position.