Well, mine certainly were not weaned too soon - they didn't start on regular food until about 10 weeks, and regularly nursed beyond six months of age (mom, having been spayed six weeks after giving birth, was long dried up by then)! My vet was amazed that their fully formed teeth did not make Peaches (mom) kick them away, but she actually encouraged them to nurse! They all nursed each other's "privates" also. They have also all outgrown any suckling compulsions, and virtually never do it anymore (they are now 2 years old). I wouldn't worry about it at their tender young age.