Baby Worries Pls Put My Mind At Rest

My baby poos nearly every hour or sometimes more. He only drinks 5 onz of milk but constantly has a poo'. It's not diaorreah.
He does not poo as much at night.
Sometimes its reallly dark green.
Is that normal or is that abnormal he is now nearly seven months and has had this problem since he was newly born.
Please tell me I no it may sound silly but I really need to know.