Floor joist problem...HELP please!!?

Wishing for a 2010 baby, Sounds like to me that you have a sub-floor plywood problem. Since you can see the sub-floor plywood, the labor cost is going to be cheaper now to repair it. Also sounds to me that the previous owner didn`t use a shower curtain, which caused this problem. You an your hubby might have to replace the sub-floor plywood in the bathroom only. Or at least replace the plywood up against the tub. Use sub-floor glue when replacing the plywood. This will stop any squeak's later on. And I recommend you use 2 inch drywall screws to secure the plywood to the floor joist. This will also prevent 'squeaking' later on. You might have to add some lumber(extra floor joists) just next to the tub area. Note: If tiling the floor, use concrete board over 3/4 inch thick sub-floor plywood. If not tile, then what ever size sub-floor thickness you have now will do. Another suggestion; If replacing any carpet in your new home, screw the sub-floor plywood down with 2 inch screws every 8 inches on only the floor joists before installing new carpet. I "Hate" squeaking floors. Good luck with your new home and your new baby/baby`s. Hoped this helped. Doing most of the work yourself will save you money. + or - $500.00 labor,$500.00 material.