While having babies sleep on their backs reduces the risk of sudden infant death syndrome (SIDS), it can impair development of their back and neck muscles, according to U.S. experts.

When babies sleep on their backs, it means they miss out on 12 hours of time they used to get on their stomachs while sleeping. This means they don't get much-needed stretching and strengthening of their back and neck muscles, which can lead to early motor delay, according to the Pathways Awareness Medical Round Table, United Press International reported.

The round table �?a group of pediatricians, surgeons, physical therapists, nurses and researchers �?developed a set of standards for stomach time that specifies when to start, how much infants need, and the best ways to encourage the activity.

About one in 40 babies is diagnosed with early motor delay, which can range from low muscle tone to cerebral palsy. Some early motor delays are present at birth and others develop or are made worse by lack of stomach time. Physical therapy can help children with early motor delay to catch up quickly, UPI reported.

Watermelons contain compounds that can benefit the heart and circulatory system and may even provide a Viagra-like lift to the libido, according to Texas A&M researchers.

"The more we study watermelons, the more we realize just how amazing a fruit it is in providing natural enhancers to the human body," Dr. Bhimu Patil said in a prepared statement, United Press International reported.

Patil and colleagues found that when watermelon is consumed, a phyto-nutrient called citrulline is converted into an amino acid called arginine.

"The citrulline-arginine relationship helps heart health, the immune system and may prove to be very helpful for those who suffer from obesity and type 2 diabetes," Patil said. "Arginine boosts nitric oxide, which relaxes blood vessels, the same basic effect that Viagra has, to treat erectile dysfunction and maybe even prevent it."

In addition, Patil said deep-red varieties of watermelon also contain plenty of the antioxidant lycopene, which protects the heart, prostate and skin health, UPI reported.

Specially trained dogs can use their noses to distinguish different types and grades of ovarian cancer, say researchers at the University Hospital in Goteborg, Sweden. Early stage and low-grade ovarian tumors emit the same scent as advanced ovarian tumors.

The researchers said their study shows ovarian cancer has an odor that's distinct from other gynecological malignancies such as cervical or endometrial cancers, United Press International reported.

The researchers said "we do not believe that dogs should be used in clinical practice, because they may be influenced during their work, leading to changes in the accuracy rates," but under controlled circumstances dogs "may be used in experiments to further explore this very interesting new property of malignancies."

The study was published in the journal Integrative Cancer Therapies.