Paranoid piggy mom needs some advice about babies weights!

I’m worried/paranoid that Teddy is underweight for his breed and age group especially since his older brothers (not biological) are much heavier. I got them two months ago from my sister who didn’t take care of them properly and am worried Teddy is too small. Im upset that I didn’t start weighing them sooner since I was so focused on their cage situation, bonding my oldest with a new piggy, insurance, etc. I know weight for piggies isn’t exact but a range depending on age and breed but I’m scared he’s just too small. Please let me know what you guys think. I will be taking all 4 to the vet for a check up at the end of the month when their insurance becomes effective!

Tofu (Peruvian): 8 months (936g) Boba (Peruvian): 8 months (907g) Teddy (Silkie): 7 months will be 8 months in 2 weeks (693g) Mochi (Abyssinian): roughly 4-8 weeks (477g)