Re: "excessive" spit up?
I don't know if you can point to a given amount and say "up to x oz is normal, more than that is not". I think you have to go by the baby. If she is growing normally and doesn't seem unduly upset by spitting up, then it's a laundry problem, not a health problem.
FTR, there are more reasons for spitting up than just allergies/intolerances, including:
- normal baby spit up
- extremely fast letdown
If this were an allergy or intolerance, I think you could expect to see more symptoms than just spitting up. You'd want to look for green, watery, mucousy, or bloody poops, as well.
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