Well, it depends on your definition of "okay", the reasoning and your personal goals. If you are trying to breastfeed and would like to have a successful breastfeeding relationship... Then, no, it's really not okay unless there is a true diagnosed supply problem. First, if you are giving the formula with a bottle, it can cause nipple confusion. Secondly, every single oz of formula you give is one less oz your body thinks it needs to produce. It's a very, very slippery slope and most who start out supplementing do not make it beyond 6 weeks (some do, but most don't).
If you don't really care one way or the other... then, no it doesn't really matter apart from the well documented risks of formula feeding (which is something you should look into before making a decision on this). If you're okay with the risks, and don't want to establish a good breastfeeding relationship... then, yea, it's totally fine.
at 3:06 AM on Oct. 13, 2010