Babies can usually lighten after tanning, but if the tan is too long, the recovery time may be longer. Ultraviolet light from the sun stimulates the melanocytes of the skin to secrete melanin to protect the skin, which is why babies get darker after sun exposure. Reducing direct exposure to sunlight, or taking adequate protection when exposed to sunlight, can improve melanin secretion in infants and make them lighter. If the infant’s tanning is more pronounced, it will take longer to recover, but when the environment changes, it can still turn white, just more slowly. If the symptoms of tanning in infants are not relieved, or if the rash is accompanied by rashes, flaking and other abnormalities, you should go to the hospital in a timely manner, so that the cause can be clarified and targeted treatment can be given.