mikaela jane davidson was welcomed into the world april 4 , less than three months after her father , boston heart surgeon dr michael davidson .
mikaela 's father , dr. michael davidson , was killed at the hospital january 20 , leaving behind his wife , dr. terri halperin , daughters kate , 10 , live , 8 , and their 2-year-old son .
brigham and women 's hospital announced monday that mikaela jane davidson was born april 4 .