@bobita1017, at first the formula could give him minor constipation because it's something new being introduced to his diet. But it is okay to both breastfeed and formula feed at the same time, just make sure he doesn't get too constipated

so he will not be constipated or anything ?

he turn a week today

How long were u in the hospital ? Usually ur baby doesn't get hungry until around the time ur milk finally comes in their stomachs are so small so what u made should be enough .. The more u nurse your supply comes in ..

Yes I did that when my breast milk supply was low in the hospital.