There is a condition called physiological phimosis. It's normal upto 2 years. The area or hole through which he pees is small. It's not an issue. It will increase with time. But if there are repeated urinary tract infections, then it is advisable to do surgery..
Next Steps
You can apply vaseline or coconut oil slowly whenever you can and try to bring foreskin down. don't pull too hard, it might hurt him..unless you have repeated infections or pain or crying during the act of micturation, there is no need for surgery