How small can they be??

Yeah, same tub with momma and dad atm, still drinking milk. Thats the only reason, but I mean, if it's the megacolon I can go ahead and feed her off to stop her from being in pain!!!

Hmmm she honest might just be fat. I highly doubt shes pregnant if shes still drinking milk. I've had some really tubby babies that stayed looking pretty bloated until they got older. If she doesnt appear to be in pain, I would wait. just my :2cent:

My baby rats go through this same pudgy stage at that same age. I wouldn't worry too much about it, actually, unless she starts looking like she's skinny but with a fat belly (as, in can see or feel ribs easily). At 5 1/2 weeks, it's technically possible for her to be pregnant, but I doubt it. The adult male would be the father if she is.

Too late lol, I went ahead and fed er off to my spider ball!!! I was too worried about her being in pain that I decided to just do it!

A lot of mine look like that until they get bigger.

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I got that a ton at that age with many of my ratties. Generally I think it was caused by them moving over to solid foods from milk. Never had troubles with them.