At that point, it doesn't matter that the dog was happy to see you. Teach him to sit rather than jump. Remember you want the dog to be successful, and to have fun. If not, have it done, now. Neutered and spayed dogs make better family companions.
Unneutered males have a heightened sense of territoriality.
They tend to be bossy, pushy and willfully disobedient. They are easily distracted, making training difficult at best. Unspayed females go through hormonal changes before and after each heat cycle, causing their behavior to become erratic and sometimes aggressive. If your dog guards objects, he must learn that this is unacceptable behavior. You may be able to tell the difference between dog toys and baby toys but your baby can't.