The healthiest position for the hips is for the hips to fall or spread (naturally) apart to the side, with the thighs supported and the hips and knees bent.
A baby, when being picked up, will pull the legs up in the correct position which will place the hip joint into the socket in a perfect position to ensure correct hardening of the cartilage present the first few months after birth. This position is called squatting straddle position.
To ensure the optimum position, a baby should have the knees up, squatting , about 110º and spread, straddled, 90º.
With this squatting straddle position the baby’s buttock will be lower than the knees. This allows the baby to keep the curvature of the developing spine, which is almost a C at birth (kyphosis). Baby carriers trying to straighten this position are putting the developing spine in danger of deformation.
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