The real question here is why my BP does not eat? Most likely it is husbandry related which is affecting 90% of new owners.
At that size and age if well started BP are VORACIOUS.
So what are your options? Do this to a T and I mean to a T https://ball-pythons.net/forums/show...-hatchling-101
And please stop following advice from DR Foster and Smith while they are a great Pet Pharmacy, their regurgitated "knowledge" is not one I would recommend someone new to follow.