When I brought my girl home at about 6 weeks she was around 120g. Seems like yours is a good weight. It all also depends on how quickly the breeder can get them to take their first meal, and how often after that they feed them. Some breeders don't feed the ones they know they will sell as often as their keepers to keep expenses down.
Congrats on getting the SO to handle your.. pet (it was VERY difficult to word this statement in a way that couldn't be misconstrued)