How Much Hair is Growing in by 3 Months After a Hair Transplant?

after three months hairs stars to come out newly. so the growth will be 10-15%. This growth will continue until 1 year.

This brief video was created by a 34-year-old patient of mine after his surgical hair restoration in our office.  He had a 2453 graft follicular unit transplantation session with a conservative pattern that looked towards what would be age appropriate in his 40s, 50s and beyond.  
Taking pictures every morning after his session, he documented the gradual process.  As you can see, the 3 month mark is really just the beginning.  There is plenty more to come.

3 months is just the start of the growth process, approximately 10% growth. I always advise my patients do not judge the growth until month 12. 

At 3 months post-transplant, very little (if any) transplanted hair has started to grow.  the transplanted hair shafts will generally fall out within the first few weeks or months after surgery and then start to re-grow around month 3-4.
By 6 months, patients should be starting to see some growth, but the hair shafts will generally be fine and not very robust.  As time progresses, the hairs should increase in caliber.  They will become longer, more coarse, and this results in increased hair "mass" or density (the look of a fuller head of hair).  The final result cannot be judged until the 12-18 month time frame.
All the best,

Hi and thanks for your question.  Transplanted hair starts to grow typically at 3 months.  Not all of the follicles start at this time.  Full growth and final results are at about 1 year.