Babies

A revolution in the tools and techniques developmental psychologists use to investigate kids' knowledge and capabilities is rewriting what we know about how and when children understand their world.

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.