So I'm thinking about making the switch to powder. DD is 6 months old and takes about 12-20 oz of formula at her babysitters house and when she is home with me she nurses. I usually buy the 8oz RTF and use it if we're in the car or when I cannot nurse her.

Is there anything I should know if I go from RTF to powder? I know the consistency will not be the same. DD also uses Vent Aire bottles if that makes a difference.