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Newborn ear cartilage is softer than adult cartilage because of circulating maternal estrogen and elevated tissue hyaluronic acid. That softness gives a window of roughly six weeks of life during which many ear deformities can be molded non-surgically, with no cutting, no anesthesia, and outcomes that are typically excellent.

After roughly six weeks of life the cartilage stiffens and that window closes. The same deformity that would have molded at one week now needs watchful waiting, otoplasty later in childhood, or - if not addressed - becomes a permanent feature. The earlier in those first six weeks the case reaches a molding practice, the better the result.

In practice, the actionable referral window is the first one to three weeks. If you wait until the four-week or six-week well-baby visit to refer, the family loses runway and may lose the option entirely.

Deformities are shape problems with normal skin and cartilage structure - they often respond to molding. Common examples: prominent ears, lop / lidding, Stahl's ear, helical rim deformity, cryptotia, conchal crus, and constricted ('cup') ears at the milder end.

Malformations are structural absences - the cartilage or skin that should be there is missing or hypoplastic. Examples: microtia, anotia, severe constricted ears at the more atretic end. These typically need surgical reconstruction later in childhood and are not molding candidates.

The practical rule for a PCP: if the ear looks unusual at the newborn or two-week visit, the safest move is to refer early. A specialist can sort deformity from malformation in minutes; a six-week delay cannot be undone.

Look at the ears at the newborn exam and the two-week well-baby visit. If anything is asymmetric, lobeless, folded, flattened, prominent, or otherwise atypical, do not wait to see if it self-corrects - by the time you would know, the window has closed.

Refer to a craniofacial team or pediatric plastic surgeon that does newborn ear molding. The first referral question is whether the case is a molding candidate; the second is whether it falls inside the actionable window. Both can be answered fast on the specialist side.

If you are not sure where to refer locally, the AAP Section on Plastic Surgery and the American Cleft Palate-Craniofacial Association (ACPA) maintain directories of cleft and craniofacial teams.