Baby suddenly doesn’t want to drink from milk bottle

Hi mummies! Has anyone experienced LO drinking milk at parents place but refuse to drink from bottle at home? My LO suddenly became like this for one week… but it’s not sustainable cause I have to keep latching when he’s home and glued to him. Idk why suddenly, any tips to make him go back to bottle at home? I am also looking to potentially start sleep training so I need to ensure he takes the bottle in the day at least! (FYI he has always been bottle fed in day, latch MOTN)