How do three haired grafts usually grow after a hair transplant? I only see a few single hairs at 3 months.

Three hair grafts grow out with three hairs from a spot.  If you see only single hairs you may have had single hair grafts.  It also takes up to 6 to 12 months to see the full results.

Greetings,
It generally takes around 3 months just to start to see new growth, and I'm sure that you realize that you're still very early in the process.  You may notice now that you only have 1 hair follicles, but over time, many of those 1 hair grafts will likely become 2 and 3 hair grafts as the follicle achieves its full density and thickness.  Good luck!

Thank you for the question. Being only 3 months post procedure, at this point you should not expect much growth, Give yourself another few weeks where you should see roughly around 15% growth only. Not all hairs will start to grow at the same speed. Some will come sooner, others later. Normally its takes 6 months to see 50% growth, and up to 14 months if not more to achieve full growth. Hope this helps a bit, best wishes.