A REAL good thing to do is take him to your vet once a week while he is growing( for 1 -1.5 years) and stand him on the scale. This does many things:
1) tells his weight progress
2)gets him used to car trips
3) gets him used to vet trips
4)socializes him with all the people and animals he meets in the office
5)gives you both something to do together
6)has the vet vet give him a FREE quickie once over when he/she greets the dog.
7) gets you out of the house and away from all the chores the wife has for you this fine saturday am. (just kidding, pls hold all flames)
Most vets encourage this kind of thing because it builds good will at no cost, creats a loyal customer, and MOST IMPORTANTLY, allows the dog to come to know and trust the vet. This may save his life later and at the very least makes it easier on you and the vet on those future exams.