Hey guys my baby is 3 and half month old. She cries a lot during her bath and also vomits milk after her bath. What could be the reason?

It seems you gave bath to your baby just after feeding her and this made her vomit. It is advisable to take a bath for your baby 1 to 2 hours after feeding her. Or else, you can give her a bath first and then feed her. This will make her fall sleep after that.