My baby is nearly 10 weeks old and has been mostly breast fed since she’s been born. She usually feeds every hour and at night every 3 hours at most. Beginning of next month I’m going away/out for one night and haven’t been away from her since her birth. My mum will be looking after her (we live with my parents so baby is comfortable with her) and will feed her my expressed milk and or formula (if it runs out) during that night until I come back in the morning. She sometimes takes to the bottle and sometimes she doesn’t, how can I prepare her for then so I know she will for sure take to the bottle?