worming exbats

Hi. Could anyone advise me please?
My Gals are due for their worming, is it ok to do the 2 exbats as well?
I've had them for 7 weeks and they are filling out nicely and getting feathers. i  am just  a bit worried about overloading their little systems.
As some of you will know we lost Rosie after only a month and i am paroniod about losing anymore.
thank you x x x

Thank you joyfull, you are always so helpful