How old should a child be for the foreskin to be retractable?

Patient's question:

Six-year-old child, unable to retract the foreskin, small foreskin opening

Doctor's answer:

The foreskin refers to the double-layered skin of the penis that folds over the glans. In infancy, the foreskin is often long, covering the glans and the external urethral orifice, which is known as physiological phimosis. As one grows older, the penis and foreskin gradually develop, and by adolescence, the foreskin retracts backward, exposing the glans by adulthood. I believe most people are aware of the significant harm that foreskin and phimosis can cause to men, so it is important to seek treatment as soon as possible. In daily life, attention should be paid to dietary issues—avoiding irritating foods and maintaining a balanced diet. Additionally, regular follow-up visits may be necessary when needed.

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