Are any of my pets over weight?

Russian dwarf hamsters: 26g (last week he was 51g, 4 weeks ago he was 75g...)
Female robo: 24g (pregnant)
Male robo: 18g

Female guinea pig: 16oz
Female guinea pig: 12oz

I am worried about my guinea pigs (being over weight)
and my Russian dwarf hamster (loosing so much weight)

Are any over/under weigh, I need some way to help my guinea pigs loose weight? Thanks! x
 
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