Smithy hun, it must be very hard for you to watch her go through this. However, if your ticker is correct, she is only 4 weeks old and TBH I think that it is inappropriate to give fruit juice or sugar to a baby so young without medical advice. Charlie's immune and digestive systems are still very new. I would suggest seeing a HP or at least calling a medical line first. And I also wouldn't water down the formula - this can be very dangerous.

I am not sure of your feeding history hun, so I'm sorry if I am speaking out of turn. But if you are producing any breast milk that you could express for her, bm has laxative properties which would help her.

All the best hun, I hope you find something that works really soon