I do this every evening so I can have a break and my partner feeds him. We make 2 bottles and use a ready made formula bottle and mix with expressed breast milk, he’s 3 weeks and we do 100 ml formula and 50 ml breast milk per bottle. Tbh not sure it keeps him fuller longer, but he feeds a lot!
@Danielle which formula do you use?
The aptamil pre made bottles
With my first baby I did mix expressed milk and formula, more to progress to her taking formula as I mainly breastfed but did a bottle a day and didn't get on with expressing. But yes it was fine.