Is my snake too little?

I got my boy 8/31/20, a little over a month ago. I asked the breeder what he was feeding on and he said frozen pinkies. I asked what should I feed him? He said again, rat pinkies. I’ve feed him 4 times already. I’ve had him for a month. But as time went by, I started to think he was too little. I know weight and size has lots of factors so I’m curious if I should move up a size? I’ve researched a lot and I can’t get a good answer. I weighed him today and he’s 100 grams.... which seems a little small. The pinkies weigh 10 grams so I don’t feel like he’s super underweight since it’s 10% of his weight. It is winter and I know they slow down with feed and shedding but I’m curious. Are the pinkies too small? Is he too little? I’ve seen people say to feed fuzzies, which are the next size up I’m assuming and I’m not against it, just wondering if my boy is underweight.

I wanna upload a picture but I’m not sure how to... I’m kinda new here.

You can offer rat fuzzies weekly.

As already noted ^ ^ ^ feed next larger size prey. Pinkies (either mouse or rat) digest quickly & don't offer much to support growth. That's why your snake isn't growing much, it takes time, & it's NORMALLY a slow process either way, but yes, it's time to size up the prey. ;)

Thank you so much!!

I agree. You can probably move up to the next size at this stage if you feel your snake is large enough to accept the meal. Im guessing at 100 grams he is.