Lab puppy weight advice please! Bit concerned...

Hi all,

Brought my girl home at 8 weeks. She had a funny tummy first three days (ate something she shouldn't have) but otherwise she's as healthy and happy as can be.

I'm a bit concerned about her weight vs. Size expectations.

For context, her parents are both tall, well built but not bulky fox red working dogs from an impeccable line. The breeder said her dame was around 25kg and her sire was about 28kg. Also want to clarify these are incredibly reputable breeders for gun dogs near where I live.

When I brought her home the breeder had her as 4kg, I took her to the vets the next day and her weight was actually 2.7kg.

She's 12 weeks on Thursday and at the vets just now she's weighing in at only 5.5kg. Based on the chart the vet printed out it's indicating she'll only end up around 16-18kg. This is about 10kg less than the average adult female lab at 25kg.

The vet isn't concerned necessarily but said to keep an eye on her. She's a little "rib-y" as puppies can be, but I am actually over feeding her compared to what her food states (Pure, a British brand I've used before and is of high quality).

When she had her ten week dewormer one single but quite large round worm came out.

Doees anyone else have a similar experience with finer labs? I can't believe she'll end up so much smaller than average when both her parents were the epitome of what you'd expect from a proper working gun dog. I'm tempted to over feed her a little bit extra than what I'm doing but I also don't want to stress her system and I've heard it's bad for the joints.

I dunno, just looking for advice or something as I'm concerned she's just so small even though she's grown hugely in the 3.5 weeks I've had her.

Thanks in advance for any help!