It is true that if you neuter before reaching sexual maturity, your pet will grow more.
http://www.exoticbengals.com/spay.htm
The reason I ask is because although I do want to neuter my baby, I do not want him to even bigger. He is already a pretty big yorkie and i am carry him around..his full weight is estimated to be 10-11 pounds and i do still want to carry him around but if neutering will make him grow to 15pounds or 20pounds, i would rather wait. I don't think anyone could lug a 15pounds-20 pounds in a bag walking all around town.