It's Alive (1974)
Lieutenant Perkins: Hunting and killing babies doesn't seem to be my specialty.
Lieutenant Perkins: [Last line] Another one's been born in Seattle...
Frank Davies: [to the infant] ahhh, I know I know it hurts look I know that but everything's going to be alright see I was... I was scared like you are, shhh shh you mustn't cry because if you cry they'll hear you and they'll come
[puts rifle down]
Frank Davies: all right,its alright you're alright
[covers infant in coat]
Frank Davies: .