Start with a simple cut to get him in the groove of receiving haircuts. Some people come in with a 10 month old and want a bald fade. He still has soft spots on his skull, i prefer to start with a clean up for the first cut or first couple of cuts.
Keep it simple starting off.. it will speed up the haircut process, which will make it less of an un-enjoyable experience.
Little kids move a lot, the hair growing across the front-line of his head will usually be the last area of hair to mature.
If he does move a lot, I recommend not lining across the front until he is able to start sitting still. You don't wanna begin pushing that hair back, this early in life just to make your baby look neat.
Techniques that often prove effective -
Bribes| Rewards after haircut. During the haircut, you want to have things to catch his attention, keep his attention, distract him from whats going on with the haircut process...
Practice at home- sit them in a seat, drape them with a towel and pull out a pair of your home clippers. Utilize the bribe system from earlier, turn on clippers and allow them to become familiar with the sound of them, the vibrations. celebrate afterwards with the rewards as if he actually got a cut.
-Andrew L Davis III