Baby checkered garters weight

Hi everybody,
I’ve have two baby checkered garters for three months now, got them when they were two months old and weighted 5 and 6 grams. Now at 5 months old they are 14,5 and 15 grams, I feed them twice a week chopped up pinkies and sparingly frozen fish ( thiaminase free ). Are they growing ok or should I be concerned? I couldn’t find reliable growth charts, sorry if it’s a dumb question.
Thanks a lot for helping and sorry for eventual bad English ( I’m not a native speaker)

I don’t know what weights are good at certain ages, but I’ve raised four babies and they all grew slowly. It took a few years for them to get to a decent size.

Welcome to the community.

They do grow slowly, but I would feed them as much as they want to eat while they are very young. I used to keep a bowl with guppies in it so they could feed when they were hungry. Also gave them a chance to work to catch their food. Just a thought.

Jason