Be active as much as u can. Breast feeding helps a lot. Also wearing a type of belt around your tummy it will make your tummy go down faster. U lose the most weight after u have the baby. Oh eating healthy is the most important thing to.
Id say dont get to hung up on it, ur new baby will be hard work so alot of the weight will go just from the extra work u r doing! With my first son my weight just fell off- no diet required!! The 2nd i wasnt so lucky lol i lost a stone this way but wen my baby was 6 weeks i joined weight watchers & made an effort to walk with my baby in his pram & lost all my baby weight within 3 months, I'm gonna do the same after this pregnancy :) trying to stay fit during our pregnancy will also help :)