I used these for the first time this past year with my first baby.  She had some problems in the beginning and because of that I was unable to breast feed her.  She went through several different bottles and these are the ones which we now use.  I bought these with the thought that they would be better with keeping gasyness (?) down.  And as we never had much of an issue with gas I think they did a pretty good job.  It took a while for my daughters hand to get big enough to hold her own bottle, but now she's a pro and tends to hold it upside down so the angle is down.  The things that I don't...