>>41703948CVIII JP is not a babby version, it's the original balance. It's was changed in the US version because they didn't want American kids to beat the game after renting it.
US version ruins Grant and makes him useless. Late game is also an unenjoyable experience because of the damage scaling.
The weird thing about this game is that the difficulty varies wildly depending of the path/characters you chose. If you want real babby mode, get Sypha. If you want the hardest console Castlevania, go for the underground route.
