MILWAUKEE (AP) -- Two Milwaukee infants have died within hours of each other -- both in sleep-related incidents.

The deaths bring the number of sleep-related infant deaths in Milwaukee to four this year.

The Milwaukee County Medical Examiner says Monday that a 2-month-old boy was found unresponsive Friday morning with his 3-year-old brother on top of him. The baby had been in a bed with his brother, their mother, and the mother's boyfriend.

The mother told authorities the baby normally slept in a Pack `n Play but was brought into the bed because he was fussing.

Hours later, a 4-month-old girl was found unresponsive in a bed with her mother. The mother told authorities she had about three beers then fell asleep hours later. She woke up and the girl wasn't breathing.