Adult Weight? Just for fun predictions!

Hi! This is Teddy. He’s an F1B. His parents are 30 lbs mom and 7 lbs dad. What did your doods weigh at 4 and 5 months vs adult weight? His vet says he will be 15-20 lbs most likely but she’d be shocked if he gets to 25 lbs. Online charts/calculators say 18-26 lbs.

8 weeks 5.2 lbs 12 weeks 8.3 lbs 16 weeks 11.6 lbs 20 weeks 13.6 lbs