Is it alright to use different formula brands?

[Ang888]

As the ingredients are very similar I was wondering if it would be alright to use different formulas for my 3wk old occasionally?
We're using mamia but I'd like to use ready made for outings so we bought some aptamil.
I'm worried about upsetting dd's tiny tummy by using the different brands though.
Has anyone else done this without problems?

Yes, of course it is.

There might be small variations in taste, and your baby might find really quite loud ways to let you know which s/he does not like. But that's the only downside.