Well I don't have a scale either but one of my stoner friends has one for uhhh weighing things.... I just get a plastic container that he/she could fit in. Zero it out on the scale then put him/her in the container and there you go, you got their weight. If your saying he's 600 grams and less than a year old thats insane. No offense but I find that very unlikely unless he's like 11 months. 600 grams in a year is great but sooner than that seems really fast to me. I could be wrong (probably am ha). Any idea how long he is?