Is it normal for a baby’s testicles to be one big and one small?

It may be a normal physiological phenomenon that the baby's testicles are one big and one small, or it may be related to certain diseases. Testicular size asymmetry is usually caused by structural differences in the scrotum, hydrocele, cryptorchidism and other factors, and needs to be judged based on specific manifestations.

In most cases, slight asymmetry of the testicles in newborns is normal. There may be differences in the development speed of the left and right sides of the scrotum, especially within 6 months of birth. This difference usually manifests as one testicle being slightly larger or lower than the other, but the texture on both sides is soft and free of redness, swelling and pain. With growth and development, the testicles of most infants and young children will gradually become symmetrical and do not require special treatment. In daily care, parents only need to observe whether the testicles continue to enlarge or are accompanied by abnormal symptoms.

In a few cases, differences in testicular size require vigilance for pathological changes. Hydrocele may cause significant unilateral scrotal enlargement that is cystic but not tender on palpation. Children with cryptorchidism may have an empty scrotum on one side with compensatory enlargement of the contralateral side. This situation requires hormone therapy or orchiopexy under the guidance of a doctor. Acute testicular torsion manifests as sudden scrotal redness, swelling and severe pain, requiring emergency surgical reduction within 6 hours. If you find that the testicles have hardened texture, uneven surface, or are accompanied by fever and vomiting, you should seek medical attention immediately to check for testicular tumors or incarcerated hernia and other diseases.

It is recommended that parents regularly observe the development of their baby's testicles and pay attention to comparing the size, texture and position changes on both sides when bathing. Avoid excessive squeezing or applying heat to the scrotal area and choose a loose-fitting, breathable diaper. If you find that the testicles continue to enlarge asymmetrically, change color, or are accompanied by crying and restlessness, you should promptly go to the pediatric surgery or urology department to determine the cause through ultrasound examination. In daily care, keep the perineum clean and dry and avoid trauma caused by strenuous exercise.