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Too much time in the sun may be especially harmful for baby, according to a review of new insights by the American Academy of Pediatrics into the importance of protecting young skin. Baby and toddler skin differs considerably from the skin of older children and adults, so it’s important to protect infants from early on. The notion that babies don’t get sunburned is false; research has shown evidence of UV-induced pigmentation, starting with baby’s first exposure to summer sun. And those early changes may contribute to the development of skin cancer later on. As a result, pediatricians need to emphasize the importance of staying safe in the sun to new parents. Parents need to recalibrate their thinking and be vigorous with sun protection from early on.
What we know about sun protection is all based on studies in adults. But there are physiological differences between kids and adults in the barrier function of skin, with fluctuating lipid-to-protein ratios and various sizes of cells. Research has shown that the skin on the backs -or outside -of babies’ arms changes in pigmentation when they’re exposed to UV light. Even in the first summer of life, there is a measurable difference.
The AAP’s current recommendation is to apply sunscreen to babies six months and olderparents should use sunscreens with gentler, more moisturizing ingredients for babies -but researchers say that lower age limit is most likely flexible. There’s probably no harm in putting sunscreen on a younger child, after the first few weeks. Sunscreen is only one defense against sun exposure for babies and children -as well as adults. You should also practice sun avoidance, especially for kids under 6 months old, which means staying out of the sun during the hottest parts of the day -10 a.m. to 4 p.m. Remember also to wear protective clothing. If you are using sunscreen, be sure to use enough and to reapply regularly.
Selecting appropriate sunscreens is another challenge. In general, physical sunscreens that rely on titanium dioxide or zinc oxide to block the sun’s rays, and sit on the surface of the skin, are preferable to chemical sunscreens, which contain chemicals that may be absorbed by the skin. It can be hard to find affordable physical sunscreens, though -often marketed as "natural" sunscreens -that don’t contain preservatives such as parabens, which some experts worry may disrupt the endocrine system. The fact is that it’s hard to get away from additives.
So are parabens a problem They can be a sensitizer, but they’re not as bad as many think.
What conclusion does the passage draw in the end about selecting appropriate sunscreens

A. Physical sunscreens are preferable to chemical sunscreens.
B. It’s hard to find affordable physical sunscreens.
C. Additives contained in sunscreens are not as bad as many think.
D. Chemicals may be absorbed by the skin.

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The average man who uses a telephone could not explain how a telephone works. He takes for granted the telephone, the railway train, the linotype, the airplane, as our grandfathers took for granted the miracles of the gospels. He neither questions nor understands them. It is as though each of us investigated and made his own only a tiny circle of facts. Knowledge outside the day’s work is regarded by most men as a gewgaw. Still we are constantly in reaction against our ignorance. We rouse ourselves at intervals and speculate. We revel in speculations about anything at all-about life after death or about such questions as that which is said to have puzzled Aristotle, why sneezing from noon to midnight was good, but from night to noon unlucky. One of the greatest joys known to man is to take such a flight into ignorance in search of knowledge. The great pleasure of ignorance is, after all, the, pleasure of asking questions. The man who has lost this pleasure or exchanged it for the, pleasure of dogma, which is the pleasure of answering, is already beginning to stiffen. One envies so inquisitive a man as Jewell, who sat down to the study of physiology in his sixties. Most of us have lost the sense of our ignorance long before that age. We even become vain of our squirrel’s hoard of knowledge and regard increasing age itself as a school of omniscience. We forget that Socrates was famed for wisdom not because he was omniscient but because he realized at the age of seventy that he still knew nothing.