There is no strict limit to how many days after birth a newborn can sunbathe. If the weather is sunny and the temperature is very suitable, for example, the outdoor temperature is between 25°C and 28°C, then the newborn can sunbathe completely. This is because sun exposure will not only promote the reduction of jaundice in newborns, but will also strengthen the immune system. In addition, sunbathing can supplement vitamin D, because sunbathing can promote the synthesis of vitamin D in the skin through the ultraviolet rays of the sun, which will promote the absorption of calcium after sufficient vitamin D. After sufficient calcium will effectively avoid the occurrence of vitamin D deficiency rickets. As you can see, newborns can get sunlight in time after birth, but they need to choose the right conditions.