My ds is exclusively bf and 12 weeks old. We tried a bottle of expressed milk at 6 weeks and he took it so well I was worried he'd go off breast milk so we didn't try again until this week. I am keen to get him to take it as I go back to work on and off soonish. He uttley refuses and screams if my dh tries. We have tried fast and slow flow (2, 3 and 4) avent teats. Any advise? is it too late?