EFF - Powder vs. Ready to Drink

BigPoppa22

DW needs to EFF for medical reasons.  Our Lamaze class instructor said we should use Read to Drink formula exclusively for the first 3 months instead of powder, because it is more sanitary or less contaminated.  I assume she meant any contamination would be from our water supply.  We use Britta filtered water.

 

Has anyone else heard this advice too, or do you figure it is no big deal?  The issue is that ready to drink is much more expensive than powder AND does not come in store brands, so we are talking a huge difference between say Enfamil Premium ready to drink and Up & Up Premium powder.

 

Thanks!