Is the "Runt" puppy a bad investment?

[ahlam1399]

im defining the word Runt as smallest of the litter, all the vets papers say she is a healthy little girl but she is significantly smaller (1/2) the size of the other pups, should i be worried about this at all? She is 6 weeks old and weighs less than 1kg meaning she has been wormed but hasn't had flea stuff on as she is too small. All help is appreciated. She is a Cavalier King Charles for more context. TIA.

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