This posture consists of maintaining the rounding of the lower back, which allows the baby to gather themselves, group their limbs in flexion and build a basic sense of security. The correct position for a newborn is in the natural continuation of their life in utero. During the first 18 months, the baby's muscle tone and musculature will allow them to gradually straighten up. Newborn of a few days old, grouped, relaxed:

This will also allow them to feel the limits of their body, a phase essential to psychomotor development, and will prevent destabilising positions where they search for support: arms outstretched, legs extended, head tilted back, hands reaching... Newborn of a few days old, not grouped, searching for support, destabilised:

Supporting and containing Baby in a posture that respects and promotes their psychomotor development is an important part of babywearing. More information on the benefits of carrying in a good position. Here is a quick description of the physiological position:
- Limbs flexed and grouped toward the centre of the body
- Knees at navel height
- The pelvis tilted forward
- The lower back is rounded
- Head position in line with the spine
- Head not tilted too far forward, backward, or to the side
- Ankles not rotated relative to the shins and thighs
- Before 3–4 months, the knee spread equals the width of the pelvis
- After 3–4 months (when baby can grasp their own feet independently), the knee spread can be wider and they can wrap around the carrier.
Baby before 3–4 months, awake:


Baby after 4 months, awake, on their side:

An example of a poor position: baby suspended, unsupported, jostled. What you must avoid:
