(HealthDay News) -- Once your baby starts eating solid food, it's important to avoid offering the child possible choking hazards.

THURSDAY, March 22 (HealthDay News) -- The most ambitious government health-care initiative since the Medicare and Medicaid programs of the 1960s, and the legislative landmark of President Barack Obama's presidency, is about to face its biggest challenge.

(HealthDay News) -- Aerobic exercise, also called cardiovascular exercise, helps improve your heart and lung health. Examples include walking, running, swimming, biking and hiking.

THURSDAY, March 22 (HealthDay News) -- The U.S. Supreme Court seems likely to uphold the sweeping health-reform legislation known as the Affordable Care Act when it takes up the case next week, according to a small survey of legal experts.

THURSDAY, March 22 (HealthDay News) -- The Medicaid program is bracing for an expansion that will bring an estimated 16 million more Americans into the health-care safety net, as required by the Affordable Care Act.

THURSDAY, March 22 (HealthDay News) -- When the U.S. Supreme Court hears challenges to the national health-reform law starting Monday, it will then have to decide if the federal government has the authority to insist that people buy health insurance.

SUNDAY, March 25 (HealthDay News) -- Want a healthy snack? Consider passing the popcorn. A new study says the whole-grain treat contains more of the "good for you" antioxidants called polyphenols than some fruits or vegetables.

MONDAY, March 26 (HealthDay News) -- Very few young women with cancer take measures to preserve their fertility while undergoing cancer treatment, a new study says.

MONDAY, March 26 (HealthDay News) -- A type of bacteria from the mouth can cause blood clots and lead to serious heart problems if it enters the bloodstream, a new study indicates.

MONDAY, March 26 (HealthDay News) -- People with autism have an enhanced ability to process information, which may explain the apparently higher-than-average percentage of people with autism who work in the information technology industry, British researchers say.

MONDAY, March 26 (HealthDay News) -- Most people who go to the emergency room with chest pain aren't having a heart attack, but it can take hours or days to make a definitive diagnosis.

MONDAY, March 26 (HealthDay News) -- Nearly one in five U.S. pharmacies gave out misinformation to researchers posing as 17-year-old girls seeking emergency contraception, often saying that it was "impossible" for girls to get the pill, a new study finds.

MONDAY, March 26 (HealthDay News) -- Although the rate of Sudden Infant Death Syndrome (SIDS) dropped by more than 50 percent following the start of a U.S. campaign encouraging parents to put babies to sleep on their backs, new research suggests that risk factors other than "tummy sleeping" may explain why SIDS rates have not declined further.

SATURDAY, March 24 (HealthDay News) -- Heart attack patients who take either a high or low dose of aspirin daily have the same level of protection against another heart attack or other cardiovascular events such as stroke, according to a new study.

SATURDAY, March 24 (HealthDay News) -- An innovative approach using patients' own bone marrow cells to treat chronic heart failure came up short in terms of effectiveness, researchers report.

MONDAY, March 26 (HealthDay News) -- Antibiotics can prolong cystic fibrosis patients' lives, but the drugs also help treatment-resistant bacteria thrive in their lungs, a new, small study suggests.

SATURDAY, March 24 (HealthDay News) -- Showing patients with clogged arteries evidence of their condition makes them more likely to stick with treatments such as weight loss and cholesterol-lowering statins, two related studies found.

SUNDAY, March 25 (HealthDay News) -- Isoflavones -- a compound found in foods such as soy milk, green tea, tofu and peanuts -- may help lower blood pressure in young adults, new research suggests.

MONDAY, March 26 (HealthDay News) -- In a small and preliminary study, researchers report that they successfully froze secondary tumors in patients with incurable breast cancer.

SUNDAY, March 25 (HealthDay News) -- When it comes to what's best for their hearts, people walk a fine line between getting too much and too little sleep, a new study suggests.

SUNDAY, March 25 (HealthDay News) -- There may be a link between low levels of "bad" low-density lipoprotein (LDL) cholesterol and increased cancer risk, according to new research.

MONDAY, March 26 (HealthDay News) -- Injecting a clot-busting drug directly into a blood clot caused by a certain kind of heart attack seems to save more heart muscle than extracting the clot does, a new study shows.

MONDAY, March 26 (HealthDay News) -- A new international analysis comparing weight-loss procedures to standard diabetes treatments contends that surgery is more effective at helping people combat type 2 diabetes.

MONDAY, March 26 (HealthDay News) -- Here's a sweet surprise for chocoholics: A new study finds that people who eat chocolate regularly are somewhat skinnier than folks who don't indulge their sweet tooth.

MONDAY, March 26 (HealthDay News) -- Women should be screened for heart disease -- a leading cause of death among women in the United States -- during routine visits to obstetrics and gynecology clinics, a new study suggests.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

MONDAY, March 26 (HealthDay News) --Teen girls are twice as likely as boys to use cellphones and other electronic devices while driving, according to researchers who analyzed in-car video clips of American teen drivers' behavior.

MONDAY, March 26 (HealthDay News) -- For better health, try standing up more, a new study suggests. Those who spend 11 or more hours a day sitting are 40 percent more likely to die over the next three years regardless of how physically active they are otherwise, researchers say.

MONDAY, March 26 (HealthDay News) -- The U.S. Supreme Court on Monday began its review of the constitutionality of the controversial and massive health-reform initiative known as the Affordable Care Act. And the justices gave every indication that a little-known 19th century tax law wouldn't keep them from hearing the case.

MONDAY, March 26 (HealthDay News) -- Researchers report that injections of a novel "monoclonal antibody" lowered LDL cholesterol levels in patients with high cholesterol by as much as 72 percent.