My daughter had a huge gap between her front teeth until she was 10. When she was 9, her dentist told me she needed a frenectomy to allow her teeth to come together. The options he presented were to go to an oral surgeon who would give her anesthesia and then cut the frenum out and stitch it back up (she would be out of action for 1 to 2 weeks to heal) OR he could do it in his office with a soft tissue laser and 1 shot to numb the area (with little to no down time for healing).
I opted for the laser procedure. He gave her a shot to numb the area and then spent about 15 minutes removing the tissue. The laser cauterizes the tissue so there's no bleeding and no need for stitches. He told me she could have Tylenol if it caused her any pain - which she never needed. We left the doctor's office, picked up an ice cream cone on the way home, and pretty much had a typical evening. She went to school the next day followed by competitive soccer practice and had no problems whatsoever.
Within a year, her teeth have come together closing a quarter-inch gap.
Since your child is so young, wait another year at least (his permanent teeth probably won't come in until age 4 or 5 at the earliest). And, seek out a dentist that uses soft tissue lasers in their practice who can do this.