I have lost water pressure in my bahtroom sink and toilet but the tub is working find... please help

1st make sure angle stop valves are fully open, then 2ndly I would disconnect sink and toilet water supplies from the fixture but make sure angle stops are shut off before disconnecting. Get a 5gal bucket and open valves and flush it

If that doesn't work, then faucet itself probably clog or the aerator and the fill valve on toilet is probably clog.