It is OK to combine the two, but there are some things that need to be taken into consideration about it ---
When you supplement with formula, the baby is getting something (obviously) from an outside source. This means that for this feeding, your breasts are not being stimulated by his mouth to produce more milk. If its an occasional (being once a week or something) feeding, I wouldn't worry about it (though over the course of a week, you could probably pump enough milk to feed in a bottle anyway). But if you're doing it frequently, I would advise caution because you could be risking yourself of lowering your milk supply.
It can be a bad cycle to get into, because the more you rely on outside sources of nutrition (be it formula or solids), the more your milk supply will decrease, and subsequently, the more you will have to continue relying on formula/solids.
I would say first and foremost- try to trust your body. If your baby is growing, and thriving, and wetting and pooping the proper number of diapers on exclusive breastmilk, let it be. Most (most as in 98%, not most as in 60%) mothers really do have enough milk. But when you bring in outside nutrition, it means baby's not on the breast telling your glands to make more!
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