My sons latch isn't very good but we are working on it. I am breast feeding him then expressing and topping him up with either expressed Breast milk or formula in a bottle.

He is more or less getting 50% breast milk and 50% formula a day. I know this isn't as good as exclusively Breast feeding but I'm wondering how much health benefits he is getting doing this? It's hard work as I express every 3 hours and only get upto 2oz combined each time. But as long as I know this is benefiting him I'm happy to keep this up or is the formula ruining the health benefits?

He was 9lbs 9oz at birth so I'm struggling to keep up with his needs. As he grows it will end up that he's maybe only going to get 20% of his daily intake as breast milk and. I'm wondering if there are health benefits to this.