Can I use both aptamil comfort and premade bottles?

[fireflyfox]

Hi,
As the title suggests. My 3MO son is mainly breast fed with a few formula top ups a day (equals less than 10 ounces).

We wanted to try using aptamil comfort instead of regular as he has infrequent BMs and seems to get uncomfortable mainly in the evenings and wanted to see if this helps.

But, when out and about we use the premade bottles just for ease, so I was wondering if we could use both the first and comfort formulas so we can continue to use the premade bottles when out.

Would this be an issue?

If infrequent BMs are the only problem you could also try another formula brand first. Although equivalent nutritionally I found my baby had more frequent BMs after changing from Aptimal to Kendamil (went from every 4-5 days to 1-2 days). Kendamil is more expensive and harder to get hold of though.