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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.