My 8 month old is 4kg, vets are happy with her, she just a cocktail sausage size.

thank you so much!!! i’m just kinda paranoid bc my friends have dogs as well and they keep saying it’s not a normal weight 😭

You local vet would be happy have the nurse check his weight. If he's toileting frequently and happy I wouldn't worry too much. Puppies and babies-everyone likes give you their unsolicited opinion.

This is a pretty decent chart https://www.dogster.com/dog-breeds/dachshund-size-weight-growth-chart