Also at the start of a bottle feed, put the teat towards the roof of their mouth as that will initiate their sucking reflex
We've just started introducing expressed milk in a bottle, we use the tommee tippee natural start bottles with slow flow teat (got a newborn starter set off amazon). Not sure if it helps but we give her the dummies that came with the set since about 2 weeks old for naps. We started bottle feeding yesterday and she took 100ml of fridge cold breast milk (previously frozen and thawed in the fridge for 12-24hrs) If you are thawing frozen milk have a look into of your milk has high lipase as when frozen the taste changes which could put baby off
Lansinoh bottles are the only bottles my two have ever taken after being EBF. It will take a while to get used to if they’ve never had one before, my boy takes a bottle from me better than from his dad. Assuming you’re using expressed milk it Could be worth dipping the teat in the expressed milk at the beginning of a feed so baby knows whats coming and is less likely to refuse. Ensure he is pace feeding baby too, let baby control the flow of the bottle and stick to the slowest flow teat. Ensure baby isn’t starving at the point you want them to have a bottle, maybe give a little feed off the breast first and hand off to dad so baby is calmer. My little boy will only take 30ml max from a bottle at the minute but with time and patience and consistency he’ll eventually take more. Bottle feeding is a new skill baby has to learn so patience really is key xx