Our bodies produce vitamin D after the skin is exposed to sunshine. But ideally your baby won't be sunbathing at all in the first six months, so he won't get enough vitamin D from the sun â even if you live in a relatively sunny place, such as Florida.
Or they should, anyway. While leaves will always change color as the amount of sunlight wanes, several weather conditions can affect how brilliant they become. High heat or drought can rob leaves of their brilliance, or make leaves drop early. Insufficient rain in September can also hurt peak color.
Most land plants are green (their stems and leaves, anyway) because the accessory pigments are chlorophylls, including chlorophyll-b and chlorophyll-c. When green leaves turn colors in the fall, or turn yellow due to nutrient limitation or disease, the chlorophylls are breaking down and being re-absorbed, allowing the other pigments to show through.