Naw, they look fine.
I've never seen an overweight baby. They typically utilize the food. That said, I have seen some young (4-6 year old) snakes keel over and die for no apparent reason, and necropsy shows high fat in the snake.
I do think that only feeding rodents (especially when fed rats) they are getting higher fat than in the wild. For a few reasons. The rodents are captive, whereas their wild counter parts are more active. The snakes in the wild eat a variety of food, including birds, eggs, lizards, etc. Food sources that are lower in fat.
I think that alternating food source (adding in quail, chicks, etc) would be healthier in the long run for the snakes. I have ordered baby quail and chicks for that reason.
My opinion on babies, is that in the wild, they eat to grow (quickly). The longer they are smaller, the more of a chance they have of becoming a meal to another animal. The faster they grow up, the less chance they have of being eaten.
I typically feed once a week because of convenience, with my schedule. Sometimes I will feed after 5 days, and sometimes they go two weeks between meals, but usually it's once a week.
