DS2 is 3 months old and feeding well but often, as is normal for breastfed babies.
I partially breastfed DS1 for 9 months but he had formula top ups from day 1 because he was born with low blood sugar (I had undiagnosed GD). As DS1 was also a big baby and my first I was constantly worried he was hungry and didn't trust I was making enough milk.
Eventually the top ups became more frequent and m y milk dried up, which combined with the fact that he preferred the bottle as he got older and more active meant I stopped breastfeeding before I wanted to.
This time I have established nursing properly, DS2 is gaining weight steadily and I just don't want to interfere with it. DP thinks the commitment to nursing and the time it takes means I'm less available to DS1, now a two year old and to DP himself. I think he would also like to feed DS2 and I struggle to express milk in any quantity. To be clear he doesn't want me to stop breastfeeding, just to introduce some formula too. I don't want to, AIBU?