Why my 5 months plus baby scream in high pitch ? Can anyone share with me ?

It is totally normal for baby to scream. It is a form of communication between them and you. Nothing to worry about. As they are still developing ways to communicate with us, parents, they will only cry or scream.

it's perfectly normal and it's his way to express that they need something. may it be a milk, a diaper change or a comfort.

Future singer maybe? On the serious note, baby should be fine. :)

Practicing to be Mariah Carey

It's normal. No need to worry