Babies

Unusually hot or cold weather may affect the birth weight of babies, a new study suggests.

Two scientists set out to create a song that was scientifically proven to make babies happy.

A new study suggests we learn the sounds of language well before we learn to speak.

Babies whose mothers are obese may be biologically "older" than babies whose mothers are a normal weight.

On Sept. 28, the Columbus Zoo and Aquarium welcomed a new addition: a male western lowland gorilla, born at 1:18 a.m. ET.

Twin boys who were born joined at the head are now successfully separated after they underwent a rare surgery that took more than 20 hours.

Opioids may affect how cute people think babies are, a new small study finds.

Smoking marijuana during pregnancy doesn't appear to increase the risk of preterm birth or other harmful birth outcomes, a new review study suggests.

A baby in Brazil who became infected with Zika in the womb still had the virus in his body for months after he was born, according to a new report of the case.

The percentage of U.S. mothers who breast-feed their newborns continues to rise.