Adding formula to breastmilk

BJ

I’m trying to see if my baby can transition to formula. I have been dairy and soy free for 7 months and I’m slowly going to wean pumping if possible.

I have only given one ounce per bottle today mixed with breastmilk and he’s spit up a couple times. He usually does not spit up. Is this normal for him to get used to or a sign his body can’t handle ? The doctor gave me samples of similac alimentum.