Well as your Cookie had just one baby, Chocolate or Fudge had enough space to be a bigger baby. Anyways, you know they are born with open eyes and with fur (hamsters are totally another story). You said your two females are around 6 months. They are not fully grown, they are way bigger then a hammy
http://www.guinealynx.info/weigh.html (one of my boars has 3lbs!).
Oh I saw now one of your posts upon space. You can search our cage galleries and find a good solution for you and your piggies needs and best interest, looking at hundreds of pics
Cages - Guinea Pig Cage Photos
The space that counts is the lower one (piggies are not so much climbers). So you need to have the right footage on the lower side. You can use those 2x5 grids (but make the cage in a corner, L shaped or so, if you have no length space). On the upper deck you can keep hidies and such, their kitchen and so on. Or if Chessie doesn't get along with the other two, you can multilevel your cage with another C&C cage, so you use no length, but hight of your space. I am sure you can figure something out!