This depands on the type of faucet you have, however looking at the link below this answer, may help.
Defective faucet or foreign material got into faucet at installation. Improper installation.
A tub faucet acts as a shower and can be used to bath in the bath tub. It is a pressure valve which makes the flow of water through it constant and gives a nice shower.
To fix a leaking tub faucet using a tub faucet repair kit, first turn off the water supply to the faucet. Then, follow the instructions in the repair kit to disassemble the faucet and replace any worn out parts such as washers or O-rings. Reassemble the faucet and turn the water supply back on to test for leaks.
The tub faucet leaks when the shower is turned on because the diverter valve, which directs water flow to the showerhead, may not be fully closing off the water supply to the tub faucet, causing water to leak out.
It depends on the make of the faucets.
Is your bathtub faucet leaking and needs fixing?
Your tub faucet may be leaking when the shower is turned on due to a faulty diverter valve. This valve directs water flow between the tub faucet and the showerhead, and if it is not working properly, water may leak out of the faucet when the shower is in use.
Kohler brand faucet
kholer faucet, tub, or toilet
go over the faucet (there is a walk through)
When selecting a deck mount bath tub faucet, key features to consider include the faucet style and finish, the number of handles, the spout reach and height, the installation requirements, and the overall design aesthetic to ensure it complements your bathroom decor.
A bath tub faucet cover provides child safety by cushioning hard edges and preventing bumps and bruises. It also helps control water temperature to prevent accidental burns, making bath time safer for children.