I cant help much in regards to weight as i never weigh my animals, but I kept a pair of everglades rats (basicaly the same as yellows) years ago.

I remember them hitting about 3' around the 1.5 year mark but being very slim. it wasn't until they were 3 - 3.5 years old that they started to thicken up and gain weight, before that they just got longer and longer but stayed skinny.

despite being thin, they were always active and felt very strong when held.

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