Frustrated with supply
I would breastfeed first for every feed. Only after offer formula. Supply is directly related to demand, so the more often your baby suckles, the more your breasts will know to make. Pumping does not stimulate your breasts the same amount as actual suckling. Also, the amount of milk you pump out is not the amount that your baby is getting in a feed. Suckling is much better at getting milk out.